unix 'su' command

I am not very clear about 'su' used in unix. I would like to knoe what they do. how and where, when to use. Any ideas, sample code, resources, links highly appreciated. thanks in advance
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gudii9Asked:
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ManjitkCommented:
The su command, also referred to as super user, substitute user, spoof user, set user or switch user, allows a computer operator to change the current user account associated with the running virtual console.

Kindly refer below link:
http://www.linfo.org/su.html

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farzanjCommented:
su : switch user / super user

Become super user (root)
su
Become root user with environment
su -

Become user john
su john
Become user john with john's environment set
su - john
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