At the heart of Avast's antivirus software is a powerful and constantly updated threat detection engine. This engine utilizes a combination of signature-based scanning, behavior analysis, and machine learning to detect and block a wide variety of malware, including viruses, ransomware, spyware, and phishing attacks. Avast's proactive approach to cybersecurity ensures that users are protected from both known and emerging threats in real-time, offering a robust defense against the constantly evolving cyber threat landscape.