Antivirus programs are an effective way to protect computers and data from viruses. They work by identifying and removing viruses from a computer's memory, storage, and incoming files. Antivirus software scans for programs that modify the operating system or other programs and also scans files downloaded from the web, email attachments, and removable media. Antivirus programs look for virus signatures or definitions to identify viruses, and vendors allow users to regularly update signature files to protect against new viruses. While no method guarantees complete safety, installing and updating antivirus software is an effective technique for safeguarding computers and data.