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Antivirus is software that protects computers from viruses, worms, Trojans, spyware, adware, rootkits, and other malware. It searches for cyberthreats by looking at data (web pages, files, software applications) as it travels over networks and on your devices. Once a potential threat is identified, antivirus can isolate it, block it or delete it. Many solutions will also display a notification or warning when it finds malware, so you can take action quickly.

However, even the best antivirus software can make mistakes and misidentify secure programs as malware. As a result, you’ll sometimes find that system updates or other important pieces of software are quarantined or deleted by your antivirus program. This can be a huge inconvenience, especially if it happens on a business machine that’s being used to complete critical tasks.

Another factor to consider is how much of your computer’s resources the antivirus software uses during scans and while in regular use. You’ll want to avoid antivirus programs that use a lot of memory or CPU power, as this can slow down your device and affect its performance.

Finally, you’ll want to consider the antivirus software’s compatibility with your operating system and its range of security features. Look for a solution that works with the platforms you use, and one that offers additional security options like a VPN or password manager. Also, make sure you can get customer support when you need it. The best antivirus programs offer 24/7 phone and live chat support, as well as extensive knowledge bases.