The PUA Shield discovers potentially unwanted software that is hidden within legitimate software.Our intelligent learning system NightVision protects you and your devices against new and evolving threats.Once a new thread has been identified, you are instantly protected against it. Our Protection Cloud can detect these never-seen-before attacks. This way, we protect you from Zero-Day-Attacks, where cybercriminals use new methods to infiltrate your system. The fingerprints of new unknown files are automatically uploaded to our cloud and analyzed in real-time. Avira’s free antivirus software uses the latest cloud technology to offer you the fastest and most reliable real-time scanning and data protection.