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Avast is a multinational cybersecurity software company headquartered in Prague, Czech Republic. It is one of the largest cybersecurity companies in the world, with over 435 million active users as of 2023. Avast develops a variety of cybersecurity products for individuals and businesses, including antivirus, anti-malware, firewall, and virtual private network (VPN) software. Avast's products are available on a variety of platforms, including Microsoft Windows, macOS, Android, and iOS.