s5nelson is spot on. I'm actually doing a degree in 'Applied Multimedia' We do exactly that, a bit of everything, from the graphics side of things, Flash, Web design, 3D (3DsMax) and then audio side of things, audio production/recording, and video stuff, we made movies in one class.
Multimedia is just anything, multi- multiple, media, well media. haha.
Programs can help you achieve a lot in technical skills. Like it was already said above, Flash does animation, the more you invest in it, the more you get out of it. you can do basic stuff without much computer knowledge at all, it's not that complicated. But you can also achieve a lot and make complex flash games with the right knowledge of programming and so on...
3Ds Max for example is used for a lot of the video games out now and some movies.
Dreamweaver and other programs for example can help you make interactive content online, make a website.