What is the difference between antivirus software and a VPN?
Short answer
Antivirus software protects your device against malicious code, whereas a virtual private network (VPN) protects your internet traffic and data in transit. Antivirus detects, quarantines, and removes malware such as ransomware and spyware already on or entering your system. In contrast, a VPN creates an encrypted tunnel between your device and a remote server, masking your network address and shielding your browsing activity on untrusted networks.
The details
The core difference lies in the threats they mitigate. Antivirus monitors system files, processes, and downloads for unauthorized modifications or known threat signatures. If an infected attachment slips through, antivirus intervenes to halt execution. However, an antivirus cannot hide your browsing habits from your internet service provider or prevent packet interception on an unsecured wireless network.
A VPN encrypts the packets leaving your device, preventing eavesdroppers on public networks from intercepting data in transit. However, a VPN offers zero defense against malware. If you connect through a VPN tunnel and download a malicious executable or submit your password into a credential harvesting form, the VPN safely encrypts the malicious transmission without stopping the compromise.
Using one tool does not replace the other because they solve entirely separate security problems. Guidance from agencies like CISA emphasizes layered defense, including keeping software updated and deploying protections appropriate to specific risks. Most users benefit from built-in operating system security alongside cautious network practices.
What to do
- Keep your device operating system and built-in antivirus definitions updated automatically.
- Enable real-time scanning in your security software to detect malicious downloads promptly.
- Turn on a trusted VPN when connecting to untrusted public Wi-Fi networks.
- Never rely on a VPN to prevent phishing, fraudulent websites, or malware execution.
- Verify that any VPN service uses modern encryption protocols without logging connection history.
Terms explained
- HTTPS and TLS
- HTTPS is HTTP protected by TLS encryption, which keeps data between a browser and a website private and tamper-resistant and confirms the site controls its domain.
- Malware
- Malware is any software designed to harm, spy on or gain unauthorized control of a device, network or account.
- Ransomware
- Ransomware is malware that encrypts or steals data and demands payment to restore access or prevent publication.
- VPN
- A VPN (virtual private network) creates an encrypted tunnel between your device and a VPN server, hiding your traffic from the local network and internet provider.