In this post, I will describe the open-source vulnerability scanning and network scanning tool that is NMAP. The full-form of NMAP is network-Mapper. NMAP is a very popular tool. Because this tool is free and open-source and used world-widely to find any vulnerability in any system or to scan a network. We can gather much important information from this tool like operating system detection, host scanning, open ports, any security risk, and much more.