Antivirus – How Does It Work?
Antivirus is software that protects computers, laptops, servers and other devices from malware. Malware is code that can steal your data, encrypt it so you can’t access it, or even erase your hard drive entirely. It can hide in attachments to dubious emails, or be delivered on USB drives containing dangerous payloads, or be downloaded when visiting a risky website.
Traditional antivirus protection works by identifying the “signature” of malware files based on their binary patterns and digital fingerprints. They then add that signature to their list of known viruses. Once a virus is detected, it can be blocked and removed from your device with tools in the antivirus program.
The best antivirus programs employ a combination of methods to find and block malicious files, including sandboxing for unknown programs that allows them to run but prevents them from causing permanent harm. Many also include firewalls and spam filters to help keep ransomware, spyware, phishing attacks, and other common threats at bay.
When shopping for antivirus, consider the detection rate—the percentage of malware that a given program stops in controlled tests. This can give you a good idea of how effective a program is at finding new threats, especially those that aren’t yet part of the database. Also look for heuristic or behavior-based detection, which can supplement or replace signature-based scanning and provide additional layers of defense. Finally, make sure that the antivirus you choose updates its threat definitions frequently to ensure it has the latest information about newest malware strains.