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  • When you are connected to the Internet, your computer can be exposed to malicious websites and malware, such as viruses. Antivirus software helps to protect your computer against these threats.

    Definining Viruses

    A computer virus is a batch of malicious programming code that is designed to make copies of itself and distribute itself in your computer's operating system, like a biological virus does in your body. Its behavior varies from deleting files to retrieving sensitive personal information.

    How Antivirus Programs Work

    Every virus has a "signature," like a fingerprint. Antivirus programs are designed to recognize these signatures. They can also detect virus behavior while not detecting the virus itself.

    Virus Evolution

    Some viruses can change their signatures over time. These are known as "polymorphic." New viruses are introduced over time, so your antivirus program needs to be updated regularly with new signatures.

    Security Suites

    Antivirus programs are commonly packaged with security "suites." These suites can monitor Internet browser activity for malicious websites, scan your email for spam and manage parental controls to filter out websites that you don't want your children to visit.

    Program Variety

    Some antivirus programs are more effective than others, and a formerly weak program can be updated to make it stronger. You should refer to product reviews if you're shopping for antivirus programs to make sure you're getting the most protective one.

    Source:

    Google.com: Gmail virus scanning

    Microsoft.com: How antivirus programs work

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