What is Ip spoofing, Why is it done, and How is it done?

Holy crap dude. You ask the same [censored] question over and over. Seriously, all you have to do is type in whatever you have following "What is" into Google and you'll get good [censored].

http://www.securityfocus.com/infocus/1674

Yes everyone has the ability to search, but most cant find the info so www.searchlores.org this site will teach you the proper techniques on searching
basically ip spoofing works by constructing your own packet and chaning the source address and of course thats very simple in c\c++
You break down a packet into different sections and change them to suit what you are doing
Why do people use this.. Well there are to many reasons some use it on smurf servers... these servers reply 1000+ times for each packet u send to it.. so if you spoof the packet with a targets address it will send them 1000 packets for every 1 u send.. and some of these servers have some nice bandwidth so after like 100 packets u send there connection is dead and voila a good ddos..
but of course you shouldn't do this its naughty lol

Dont get lazy and expect everyone to help you if you didnt even bother searching it your self. Its not hard at all to find some good txt's. Use google. Zone-h, or packerstorm. Theres 1000's of sites out there with some decent txts. If u searched and read and still dont understand the basic and syntax of it, then post for some help. You will never learn if people keep finding you the txt files.

Dont get lazy...

Ok sorry, next time i think of a question that needs answering ill search first.