Formula to search for data

I have a sheet with a list of some of our computer user names and other various info. I have another sheet that has ALL user names and email address'. I am trying to get the email address' filled in for the select users on the first sheet. What I need if possible is a way for the first sheet to search the second sheet for the username and fill in the associated email address on the first sheet.

Is this asking to much or do I just have to do it manually?
Thanks,

Use a vlookup function

Thanks so much, I did not know about the Vlookup.

It worked PERFECTLY!!


Thanks again