Avast Antivirus is a widely used antimalware program. It was first released in 1988 and is now owned by AVAST Software. The program uses a variety of techniques to detect and remove viruses and other malware, including signature-based scanning, heuristic analysis, and cloud-based protection. It also includes features like a firewall, a sandbox, and a password manager. Avast Antivirus is available for Windows, Mac, Android, and iOS devices.