Virustotal is a cloud-based malware detection service that uses multiple antivirus engines to analyze files and URLs for potential threats. Users can submit files or scan URLs to check for safety, with over 70 antivirus engines being leveraged for comprehensive threat intelligence. The platform's user-friendly interface offers detailed scan reports, making it a valuable tool for cybersecurity professionals. Virustotal plays a crucial role in safeguarding against cyber threats by providing real-time analysis from a variety of security products.