Antivirus programs are software designed to detect, prevent, and remove malicious software, commonly known as malware. They help protect computers and devices from threats such as viruses, worms, and trojans, which can harm systems or steal personal information. By regularly scanning files and monitoring system activity, these programs ensure that users can safely browse the internet and use applications. Most antivirus programs offer real-time protection, meaning they actively monitor for threats as they occur. They also provide regular updates to their virus definitions, which helps them recognize and combat new types of malware. Popular examples of antivirus programs include Norton, McAfee, and Kaspersky.