Animal Kingdom is the newest of the parks at Disney World. The Tree of Life stands tall within it and is carved with different animals that you can see as you walk around. For animal lovers they have a safari. You can also stay at one of the resorts and it backs up to Animal Kingdom land and if you are lucky you can see animals during your stay.
Hollywood Studios (or MGM as us faithful call it) is based around movies and TV shows. They host Star Wars weekend in the spring every year and have two rides for thrill seekers. Tower of Terror is a drop tower and Rockin' Rollercoaster is a fast paced inside roller coaster that plays Aerosmith as you travel from a sound booth to a concert. They also have Pixar land where the new Toy Story ride is. Be prepared to wait 3 hours on some days for this ride.
Epcot Center Dr
EPCOT is a park more for learning and experiencing new things. The front of the park is dedicated to teaching. Spaceship Earth is my favourite ride, you go in the dome and it goes through the history of how communication has changed in civilization. The back of the park has the world show case. This is where they do the Food and Wine festival in the fall.
Magic Kingdom is the park everybody knows about. It has Cinderella's castle and lots of rides for children and adults. Space Mountain is an inside roller coaster that is mild enough for kids as long as the meet the height requirement. For younger kids there are always characters around happy to take pictures. Characters build up long wait times.