Avast Antivirus protects devices from various threats through real-time protection, comprehensive scanning options, and advanced security features. It includes Core Shields such as File Shield, Behavior Shield, Web Shield, and Mail Shield to detect and block malware, suspicious activities, and malicious content in real-time. The software offers multiple scan types, including Smart Scan, Full Scan, Targeted Scan, Custom Scan, Boot-time Scan, and Network Inspector, to identify and address threats, vulnerabilities, and performance issues. Additional features like Quarantine, CyberCapture, and Ransomware Shield provide enhanced protection by isolating suspicious files, analyzing rare threats, and safeguarding sensitive data. Avast also includes a firewall, Wi-Fi Inspector, and phishing protection to secure networks and online activities, ensuring robust defense against malware, ransomware, and other cyber threats.