The man pages are a user manual that is by default built into most Linux distributions (i.e., versions) and most other Unix-like operating systems during installation.
The Linux Man Pages reference provides beginners with a simple introduction to the basics, and experts will find advanced details they need.
They provide extensive documentation about commands and other aspects of the system, including configuration files, system calls, library routines and the kernel (i.e., the core of the operating system). A configuration file is a type of simple database that contains data that tells a program or operating system how to behave. A system call is a request made via a software interrupt (i.e., a signal to the kernel initiated by software) by an active process for a service performed by the kernel. A library routine is a subprogram that is used by programmers to simplify the development of software.
The man pages are tailored to the particular operating system, and version there
