Introduction to Nmap Tool

It is a free-to-use and open-source network scanner. You can use it for security auditing and discovering networks. It can perform detection of operating systems and network ports.

Network admins and security analysts also use Nmap for network inventory, management of service upgrade schedules, checking service uptime, etc.

Using raw IP packets, Nmap finds the availability of hosts on a network, the services provided by the hosts, active OS, types of filters and firewalls, and several more characteristics. 

While it works well for most of computer OS, the official binary packages are meant for Windows, Mac Os, and Uinux.