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When you use man pages, you will notice some numbers at the beginning and at the end of the man page like this:

man ls

LS(1)                            User Commands                           LS(1)

NAME
       ls - list directory contents

SYNOPSIS
       ls [OPTION]... [FILE]...
 
=========================//=============================

SEE ALSO
       The  full  documentation  for ls is maintained as a Texinfo manual.  If
       the info and ls programs are properly installed at your site, the  com?
       mand

              info ls

       should give you access to the complete manual.

ls 5.97                          January 2007                            LS(1)

that number LS(1) indicates the section where man page of LS belongs.

the most common sections and what they mean are:

Section Contents

1
User Commands
2
System Calls
3
Subroutines
4
Devices
5
File Formats
6
Games
7
Miscellaneous
8
System Administration
n
New

These indicates you also what is the command for, as an example ls belongs to section 1, so it is a command anyone can run, while fsck belongs to section 8 which means only root can run it.