Audio-visual aids and reading comprehension

I'm always on the move, with images and sounds. I can make you understand, concepts never heard. What am I?

I am a colorful graph, data I can organize, with just a quick glance, I can help you study. What am I?

I have branches and connections, ideas I can show, I'm a special diagram, the better to remember. What am I?

I am a picture with words, that in a book you can find, I help to understand the text, and better to remember. What am I?