Poser is a cool,advanced and kinda easy but very expensive 3d character pogram ^_^
You can do a lot with it
but mostly you do is import a character in it and play with its poses,expression and more...er thats what i di but you can do more (when you buy it you get this huge manual book O_o)
heres a link to learn more:
http://www.curiouslabs.com/go/poser5/