VirusTotal is a free online service that analyzes files and URLs for viruses, worms, trojans, and other types of malicious content. By aggregating results from dozens of antivirus engines and website scanners, it provides users with a comprehensive assessment of potential threats. Users can upload files or submit URLs, and VirusTotal scans them using multiple security tools, offering detailed reports on detected issues. This service is widely used by cybersecurity professionals, researchers, and everyday users to verify the safety of files and links before opening or sharing them. VirusTotal also contributes to the cybersecurity community by sharing anonymized data to help improve threat detection.