Antivirus software mainly prevent and remove computer viruses, including worms and trojan horses. Such programs may also detect and remove adware, spyware, and other forms of malware.

A variety of strategies are typically employed. Signatures involve searching for known malicious patterns in executable code. However, signatures can only be updated as viruses are created; users can be infected in the time it takes to create and distribute a signature. To counter such zero-day viruses, heuristics may be used to essentially guess if the file is truly malicious. Generic signatures look for known malicious code and use wild cards to identify variants of a single virus. An antivirus may also emulate a program in a sandbox, monitoring for malicious behavior. Success depends on striking a balance between false positive false negatives. False positives can be as destructive as false negatives. In one case a faulty virus signature issued by Symantec mistakenly removed essential operating system files, leaving thousands of PCs unable to boot.^[1]

Anti-virus software can have drawbacks. If it is of the type that scans continously, antivirus software may cause a significant decline in computer performance, it may present computer users with a decision the user may not understand. Antivirus software generally works at the highly trusted kernel level of the operating system, creating a potential avenue of attack^[2]

The effectiveness of antivirus software is a contentious issue. One study found that the detection success of major antivirus software dropped over a one-year period.^{[citation needed]}

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