Nessus is a computer security tool designed to detect vulnerabilities in networks and systems. Developed by Tenable, it allows for detailed analysis to identify security breaches, incorrect configurations, and potential risks of cyberattacks. It is used by IT administrators and cybersecurity teams to maintain the protection of digital infrastructures. Nessus stands out for its ease of use, its updated database of threats, and its ability to generate detailed reports. It is a key solution for preventing attacks before they occur and ensuring the security of corporate and personal systems.