What Is Security Software?
Security software is any program designed to protect a computer, its data, and its user from malware, hacking, and other online threats. Common types include antivirus and anti-malware software, firewalls, password managers, and browser protection tools. Most modern operating systems include built-in security software, and you can add more protection based on your needs.
Security software is one layer of protection. It works best alongside regular software updates, strong sign-in methods, and safe browsing habits.
Security software essentials at a glance
Antivirus and anti-malware software detect and remove malicious programs
A firewall controls which network traffic can reach or leave your PC
Windows 11 and ChromeOS include built-in malware protection
Hardware-based security features can protect a PC below the operating system
No security software can protect against every threat, so safe habits still matter
What Threats Does Security Software Protect Against?
Security software mainly protects against malware, short for malicious software, which is any program designed to damage a device, steal information, or gain unauthorized access. It also helps block phishing websites, unsafe downloads, and network attacks.
Threat | What it does | How it often spreads |
|---|---|---|
Virus | Attaches to files or programs and spreads when they run | Infected downloads and email attachments |
Worm | Copies itself across networks without user action | Unpatched software vulnerabilities |
Trojan | Disguises itself as legitimate software to gain access | Fake apps, cracked software, and malicious links |
Ransomware | Encrypts files and demands payment to unlock them | Phishing emails and compromised websites |
Spyware | Secretly monitors activity and collects personal data | Bundled software and malicious browser extensions |
Adware | Displays unwanted ads and may track browsing | Free software bundles |
Keylogger | Records keystrokes to capture passwords and other information | Trojans and malicious downloads |
Phishing | Tricks people into revealing passwords or payment details | Fake emails, texts, and websites |
Phishing isn't malware itself, but it's one of the most common ways attackers steal accounts or install malware. Many security tools now block known phishing sites and warn you before you open suspicious links.
What Are the Main Types of Security Software?
The main types of security software are antivirus and anti-malware tools, firewalls, password managers, virtual private networks (VPNs), and backup software. Each protects against a different kind of risk, so they work best together.
Type | What it protects against | How it helps |
|---|---|---|
Antivirus and anti-malware | Viruses, ransomware, spyware, and other malware | Scans files and activity, then blocks or removes threats |
Firewall | Unauthorized network connections | Filters incoming and outgoing network traffic |
Browser protection | Phishing sites, malicious downloads, and unsafe websites | Warns or blocks before a dangerous page or file opens |
Password manager | Weak and reused passwords | Creates, stores, and fills strong, unique passwords |
Virtual private network (VPN) | Snooping on public or untrusted Wi-Fi | Encrypts internet traffic between your device and the VPN server |
Backup software | Data loss from ransomware, hardware failure, or theft | Keeps copies of files so you can restore them |
Parental controls | Inappropriate content and excessive screen time | Filters content and sets usage limits for children |
Endpoint protection | Advanced threats on business devices | Lets IT teams monitor, protect, and manage many devices |
A security suite combines several of these tools, such as antivirus, a firewall, and a password manager, in one product. Businesses typically use endpoint protection managed by an IT team. Learn more about business security.
How Does Antivirus Software Work?
Antivirus software works by scanning files, apps, and system activity for signs of malware, then blocking, quarantining, or removing anything it identifies as a threat. Modern antivirus tools combine several detection methods, because attackers constantly create new malware designed to avoid detection.
Detection methods
Signature-based detection: Compares files with a database of known malware "fingerprints." It's fast and accurate for known threats, so the database is updated frequently.
Heuristic analysis: Examines a file's code and structure for suspicious traits, which helps catch new variants of known malware.
Behavior monitoring: Watches what programs do as they run, such as trying to encrypt many files at once, and stops suspicious activity.
Cloud-based protection: Sends information about unknown files to the security provider's cloud service for fast analysis against the latest threat data.
Machine learning: Uses models trained on large sets of safe and malicious files to recognize threats that haven't been seen before.
Real-time protection vs. scheduled scans
Real-time protection checks files as they're downloaded, opened, or run, stopping many threats before they can act. Scheduled and on-demand scans check files already on your drive for anything that may have been missed. Keep real-time protection turned on, and run a full scan if you suspect a problem.
What happens when antivirus finds a threat
When antivirus software finds a threat, it usually quarantines the file, moving it to a secure location where it can't run. You can then delete it or, if it's a false positive, restore it. Signs your PC may be infected include sudden slowdowns, unexpected pop-ups, unfamiliar programs, or changed browser settings.
What Is a Firewall?
A firewall is a security system that monitors network traffic and blocks connections that don't meet a set of security rules. It acts as a barrier between your device and the internet or other networks, helping stop unauthorized access while allowing trusted apps to connect.
Software firewalls vs. hardware firewalls
Software firewall | Hardware firewall | |
|---|---|---|
Where it runs | On your computer, as part of the OS or a security app | On a separate device, such as a router or dedicated firewall |
What it protects | The device it's installed on | Every device on the network |
App-level control | Can allow or block specific apps | Usually controls traffic by address, port, and protocol |
Typical users | Every PC, including laptops on public Wi-Fi | Homes and businesses, through a router or network appliance |
Example | Microsoft Defender Firewall in Windows 11 | The firewall built into most home Wi-Fi routers |
For most homes, the combination of a router's built-in firewall and the operating system's software firewall provides solid protection. Keep the Windows firewall turned on, especially when using public Wi-Fi networks, such as those at coffee shops, hotels, and airports.
A firewall controls network connections, but it doesn't scan files for malware. That's why a firewall and antivirus software are used together. Learn more about laptop connectivity or computer networking.
What Security Software Is Built Into Your PC?
Windows 11 and ChromeOS both include built-in security software that's turned on by default, so a new PC is protected from the start. Many HP PCs add hardware-based security and privacy features that work alongside the operating system.
Windows Security in Windows 11
Windows 11 includes the Windows Security app, which brings together several protections:
Microsoft Defender Antivirus: Real-time and on-demand protection against viruses, ransomware, and other malware.
Firewall and network protection: Microsoft Defender Firewall filters network traffic.
App and browser control: Microsoft Defender SmartScreen warns about unsafe websites, downloads, and apps.
Device security: Hardware-based features, such as the Trusted Platform Module (TPM) and core isolation, help protect the system from deeper attacks.
Account protection: Windows Hello sign-in options, such as a PIN, facial recognition, or fingerprint, on supported devices.
To check your status, open Start, search for Windows Security, and look for green check marks on each section.
ChromeOS built-in security
ChromeOS is designed with security built in. Verified Boot checks that the system hasn't been tampered with each time the Chromebook starts, and apps and web pages run in sandboxes that isolate them from the rest of the system. Automatic updates keep these protections current. Learn more about Chromebooks.
HP security and privacy features
Many HP PCs include security and privacy features that complement the operating system's protection. Features vary by model.
HP feature | What it does | Where you'll find it |
|---|---|---|
HP Wolf Security | Adds hardware-enforced protection below, in, and above the operating system | HP business PCs; features vary by model |
HP Sure Click | Opens risky files and websites in isolated virtual containers so malware can't spread | Select HP business PCs |
HP Sure Sense | Uses deep learning to detect known and new malware | Select HP business PCs |
HP Sure Start | Checks the BIOS at startup and recovers it if it's been tampered with | Select HP business PCs |
HP Sure View | Built-in privacy screen that makes the display hard to read from the side | Select HP laptops |
Biometric sign-in | Fingerprint readers and IR cameras for Windows Hello | Many HP laptops |
Privacy camera shutter | Physically covers the webcam when it's not in use | Many HP laptops |
Learn how HP Wolf Security uses AI to protect your data.
Do You Need Additional Security Software?
For many home users, the built-in security in Windows 11 or ChromeOS, kept up to date and paired with safe habits, provides solid everyday protection. Additional security software can make sense if you want extra features, such as a password manager or VPN, or if you need centralized protection for a business.
Situation | What to consider |
|---|---|
Everyday home use | Built-in protection, automatic updates, and a password manager |
Frequent use of public Wi-Fi | A reputable VPN in addition to the built-in firewall |
Family PCs used by children | Parental controls and separate user accounts |
Small business | Business-grade endpoint protection and regular backups |
Larger organizations | IT-managed endpoint protection and device management |
How to choose security software
Download only from trusted sources: Use the developer's official website or a trusted app store. Fake security apps are a common way to spread malware.
Avoid running two antivirus programs at once: Two real-time scanners can conflict and slow your PC. Windows automatically turns off Microsoft Defender Antivirus real-time protection when another antivirus is installed and active.
Look for independent test results: Independent labs regularly test antivirus products for protection, performance, and false positives.
Check the impact on performance: Good security software protects without noticeably slowing everyday tasks.
Review renewal terms: Many paid products renew automatically at a different rate after the first term.
Security habits that matter as much as software
Install operating system and app updates promptly.
Use a unique, strong password for each account, stored in a password manager.
Turn on multifactor authentication (MFA) for email, banking, and other important accounts.
Be cautious with links and attachments in unexpected emails and texts.
Back up important files regularly to an external drive or cloud storage.
Sign in with a standard user account for everyday use, and keep admin access for installations.
For laptop-specific tips, such as protecting a device while traveling, see laptop security and safety. Ready for a new PC with built-in security features? Shop HP laptops.
Frequently Asked Questions About Security Software
Is Microsoft Defender good enough?
Microsoft Defender Antivirus, built into Windows 11, provides real-time malware protection that's suitable for many home users when Windows is kept up to date. People who want added features, such as a VPN, identity monitoring, or centralized management, may choose additional security software.
What is the difference between antivirus and anti-malware?
Antivirus originally referred to software that protected against computer viruses, while anti-malware covers all types of malicious software. Today, most antivirus products protect against viruses, ransomware, spyware, and other malware, so the terms are often used interchangeably.
Do Chromebooks need antivirus software?
Chromebooks generally don't need traditional antivirus software, because ChromeOS includes built-in protections such as Verified Boot, app sandboxing, and automatic updates. Chromebook users should still avoid untrusted extensions and apps and watch for phishing.
Can security software slow down my computer?
Security software uses some system resources, especially during full scans, but modern tools are designed to have little impact on everyday performance. Running more than one real-time antivirus program at once is a common cause of slowdowns.
Is free antivirus software safe to use?
Free antivirus software from a reputable developer can provide solid basic protection. Be cautious of unknown free security apps and pop-up warnings urging you to download a scanner, which are common tactics used to spread malware.
