Do I Need Antivirus Software, and Which Free Ones Are Good?
- Ann Mitchell
- Apr 15
- 2 min read
Updated: May 27
Antivirus software remains essential for protecting devices against malware, phishing, and other cyber threats. While modern operating systems include basic security features, dedicated antivirus programs provide stronger real-time protection, block malicious websites, and scan for hidden threats. For most users, free antivirus software offers sufficient baseline security.
Top free antivirus options in 2025 (available for Windows, macOS, Android, and iOS):
Antivirus | Real-Time Protection | Phishing & Malware Protection | Extra Features | Notable Limits (Free Version) |
Avast One Basic | Yes (some limits on mobile) | Yes (very strong) | Ransomware protection, basic firewall, limited VPN, browser cleanup | Advanced features paid, mobile protection limited |
Bitdefender Free | Yes (Windows / macOS) | Yes | Web attack prevention, behavioral detection | Fewer features on mobile, no optimization tools |
Avira Free Security | Yes | Yes | System optimizer, VPN (500MB/mo), password manager | VPN/data limited, some features paid |
AVG AntiVirus Free | Yes | Yes | Web/email shield, ransomware protection | Some features paid, mobile features limited |
Malwarebytes Free | No (on-demand only) | Yes (on-demand) | Ad/tracker blocking on mobile, privacy audit | No real-time protection, manual scans only |
How Do I Know If My Computer Has a Virus?
Common signs of infection include:
Performance issues: Sudden slowdowns, crashes, or excessive fan activity.
Pop-ups and ads: Unwanted browser toolbars or persistent ads.
Unauthorized changes: New programs, altered browser settings, or disabled security tools.
Network activity: Unexplained data usage or spam emails sent from your account.
Run a full system scan with your antivirus software if you notice these symptoms. Most programs quarantine or remove detected threats automatically.
Can My Phone Get Malware, and How Do I Prevent It?
Yes, phones are vulnerable to malware through malicious apps, phishing links, or compromised networks. Android devices are at higher risk due to open app ecosystems, but iPhones can also be targeted.
Prevention tips:
Avoid sideloading apps from unofficial sources.
Keep your OS and apps updated.
Don’t click suspicious links in texts or emails.
What’s the Difference Between Antivirus and a Firewall?
Antivirus | Firewall |
Scans and removes malware from files/apps | Monitors and blocks suspicious network traffic |
Reacts to threats already on the device | Proactively prevents external attacks |
Works at the device level | Operates at the network level |
Example: A firewall blocks access to a phishing website, while antivirus removes malware if you accidentally download an infected file. For optimal security, use both tools together.
Key Takeaway: Antivirus software is non-negotiable for basic protection, but pair it with a firewall and cautious browsing habits. Free options like TotalAV or Bitdefender provide robust security without cost
View our Basic Cyber Security Guide for further guidance.
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