This tool is open source software and was created by Gordon Lyon to track and discover ports and try it. Nmap provides a number of features for probing computer networks, including host discovery and service and operating system detection. Below, all you can do with Nmap:

• Server discovery: Identify computers on a network, for example, by listing those that respond to ping.
• Identify open ports on a target computer.
• Determine what services are running it.
• Determine what operating system and version that computer uses, (this technique is also known as fingerprinting).
• It has some characteristics of the network hardware of the machine under test.

How you can install this tool on your pc?

Nmap was created for Linux users, but there is a way to install it on windows but I am not going to talk about it today. So how I can install it in Linux (Ubuntu/Debian). All you had to do it is put this commands below in your console.