What is the difference between an antivirus and a virus?
Short answer
A virus is malicious software designed to infect devices, corrupt files, and spread across systems. An antivirus is defensive security software designed to detect, block, and remove viruses and other forms of malware. While a virus acts as the digital threat, an antivirus acts as your primary layer of software defense to protect your computer or phone from harm.
The details
Computer viruses attach themselves to legitimate files or programs and replicate when executed. Once active, a virus can damage system files, steal sensitive information, or disrupt normal operations. Viruses spread through infected email attachments, malicious downloads, unpatched vulnerabilities, and compromised storage media. They represent one specific category within the broader family of malicious software.
Antivirus software monitors your operating system in real time, scans storage drives, and inspects files before they execute. Modern antivirus solutions look for known threat signatures and analyze suspicious behavior to catch emerging threats. In addition to scanning, maintaining system updates and routine backups is recommended by guidance from the NCSC to ensure devices remain protected against software vulnerabilities.
Contrasting their key attributes clarifies their opposing functions. For target and payload delivery, a virus alters system files to execute unauthorized actions, whereas an antivirus program inspects execution requests to block them. For replication, a virus self-propagates across local drives and network shares, while antivirus detection halts transmission by screening incoming files. For containment, a virus attempts stealthy persistence, whereas antivirus software quarantines suspicious items and removes confirmed threats.
What to do
- Keep your operating system and applications updated automatically to patch security holes.
- Install or enable reputable antivirus software and turn on real-time background protection.
- Run regular security scans to identify dormant or hidden threats on your drive.
- Avoid opening unexpected attachments or clicking links in unsolicited emails and messages.
- Back up vital files to an external drive or secure cloud storage.
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.