Avast Antivirus protects nearly 200 million PCs, Macs, and Androids worldwide – more than anyone else. And it just got even better! Intelligent Antivirus with new DynaGen technology. Anti-malware Protection plus anti-spyware & anti-rootkit. SafeZone for secured payments & banking. Silent Firewall against hacker attacks. Anti-spam against phishing & scam emails.