A program that is designed to monitor and prevent, search for, and remove software viruses and other malicious software such as remote access tools (RAT), trojans, worms and more. They tend to use signature-based detection.
Anti-Virus is different from Advanced Endpoint Protection (AEP). Anti-Virus products generally do not use machine-learning or behavioural analysis which protect systems against fileless, script-based, zero-day threats and more.