Avast Ultimate combines advanced protection and optimization features including real-time antivirus scanning, malware detection, ransomware shields, VPN services, and AntiTrack functionality to block online tracking. The suite includes system optimization tools for disk cleanup and performance tuning, supports up to 10 devices across multiple platforms, and provides network security through Wi-Fi Inspector and firewall protection. Users benefit from phishing protection, email scanning, and customizable filters to enhance both online safety and device performance.