What is mean by prompts in unix ?

What is this prompts in unix..

i heard about ps1,ps2,ps3,ps4 ...

what is the use of that ? where it is used? how it is used ?
jaisonshereenAsked:
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debuggerauCommented:
prompts is something that 'prompts' the user.
see: http://www.cyberciti.biz/tips/howto-linux-unix-bash-shell-setup-prompt.html
for instance, windows command prompt shows
c:\>
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