why do we have .1 extension in MAN PAGES?

Linux and Unix-Like Fedora
1

Hello sir,
I am using FEDORA 9.
I wanted to know why do we have ".1" extension in the archives of man pages. I know we are giving

format.
I want to know the importance or purpose of this format.
Can you please tell me :confused:

2

Because the man pages come in different sections covering different areas, running man man shows me this list:

       1   Executable programs or shell commands
       2   System calls (functions provided by the kernel)
       3   Library calls (functions within program libraries)
       4   Special files (usually found in /dev)
       5   File formats and conventions eg /etc/passwd
       6   Games
       7   Miscellaneous (including macro  packages  and  conventions), e.g. man(7), groff(7)
       8   System administration commands (usually only for root)
       9   Kernel routines [Non standard]
3

For more information enter "man man"