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An antivirus program protects personal computers from malware that can steal information or disrupt operations. Antivirus vendors offer family bundles at discounted rates, allowing multiple devices to be protected under a single subscription, which can lead to significant cost savings. To set up family antivirus protection, one should choose an appropriate antivirus app based on cost, compatibility, user experience, and features. Many providers offer family plans that cover multiple devices, such as Webroot Essentials, which offers a plan for five devices at a reduced price. After selecting an app, users can opt for a free trial to assess its features before subscribing. The setup process begins with the administrator's personal device, from which family members can be invited to join the subscription. The administrator can also configure settings for connected devices, including screen time limits and web filters. Antivirus software works by scanning files against a database of malware signatures and using techniques like behavioral analysis, sandboxing, real-time web protection, and external device scans to detect threats. No single antivirus tool is the best for everyone; the choice depends on individual needs. Webroot Essentials is highlighted for its comprehensive protection, covering five devices with features like active scanning and real-time web filtering. Best practices for using antivirus tools include running only one antivirus program, enabling automatic updates, and activating real-time protection to ensure optimal security.