Antivirus software is designed to protect computers and network systems from malware, viruses, worms, trojans, and other harmful software. Popular antivirus programs include Norton Antivirus, McAfee Total Protection, Bitdefender Antivirus, Kaspersky Anti-Virus, Trend Micro Antivirus, Sophos Home, ESET NOD32 Antivirus, Avast Antivirus, and AVG AntiVirus. These programs detect, analyze, and defend against potential threats on the system. With features like real-time scanning, regular updates, and automatic cleaning, antivirus software helps maintain the security of computers and data, ensuring a safe digital environment.