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Antivirus software is a utility that detect, prevent, and remove virus and other malware activity from a computer. Also, it protects users from malicious browser helper objects (BHOs), browser hijackers, ransomware, keyloggers, backdoors, rootkits, trojan horses, worms, malicious LSPs, dialers, fraudtools, adware and spyware etc. Most antivirus programs include an auto-update feature that permits the program to search the  new viruses to kill them. Antivirus software typically runs as a background process, scanning computers, servers or mobile devices to detect and restrict the spread of malware. Many antivirus software programs include real-time threat detection and protection to guard against potential vulnerabilities as they happen, as well as system scans that monitor device and system files looking for possible risks. Antivirus security software can either be free or paid.