What is the use of ‘head’ command in UNIX system?

Head command displays the head or start of the file.
Syntax--
     head [options] file
Common Options:-
     -n number    number of lines to display, counting from the top of the file
     -number     same as above
Examples:-
By default head displays the first 10 lines. You can display more with the "-n number",
        or
"-number" options, e.g., to display the first 40 lines: % head -40 filename or head -n 40 filename