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Antivirus is software that scans your computer programs and files for the presence of malware threats. The best antivirus software will protect you from a wide variety of cyberattacks, including spyware that steals personal information; ransomware that locks your files until you pay a fee; and cryptominers that hijack your device to mine cryptocurrency. It should also provide cloud-based protection for real-time scanning and automatic updates, and it should be easy to use with a user-friendly interface.

Early antivirus programs worked through signature detection, which gave each program a thumbprint that it would check against a database of known viruses. This was effective at catching some types of malware, but hackers quickly figured out ways to disguise their attacks, so the software needed constant updating to keep up. Newer antivirus programs have advanced beyond signature-based detection, using heuristics to look for common patterns and elements in malware, and utilizing machine learning and artificial intelligence to help identify unknown viruses.

When choosing an antivirus software, be sure to compare its detection rates in controlled tests. You should also look for a software package that does not tax your computer’s resources during active scans or have an impact on the performance of other programs you are using. Additionally, you will want to make sure the software has a user-friendly interface and is easy to set up and configure according to your needs. A good antivirus tool should also offer support and customer service in case you run into any issues.