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Nessus is an open-source network vulnerability scanner for vulnerability assessments, penetration testing, and ethical hacking.

It uses the Common Vulnerabilities and Exposures (CVE) architecture and is one of the most comprehensive vulnerability scanners on the market. With Nessus, you can perform network vulnerability scanning, find misconfigurations and Denial of Service (Dos) vulnerabilities, and many more. 

Nessus provides high-speed asset discovery, target profiling, configuration auditing, malware detection, sensitive data discovery and so much more. Also, it/s available in multiple types of versions, including the Nessus Essentials the free vulnerability scanner, and Nessus professional for professional pentester and ethical hackers.

In this guide, you will install Nessus on an Ubuntu 22.04 server. You will also learn how to set up the Nessus command line 'nessuscli' which allows you to manage Nessus from the command-line terminal. You can create and manage scans via the terminal after you have installed the 'nessuscli'.