I searched here and on google and can't get a clear answer on the following distinctions between different kinds of planes and flying:

1. The difference between 3D flying and aerobatic flying. I know 3D planes look funny (very unappealing to me), but what can they do that aerobatic planes can't?

2. Sport Flying: Are there special planes for this? Or can you just fly anything?

3. What are "Profile planes"?

4. What are "Fun flyers?" Why is there a seperate category for these? Can they do something special to?

5. What exactly is a Pylon racer? I am taking a leap here and assuming you race them. I see pictures and they seem to all have a V tail. But can you race different kinds or is there one type of Pylon racer? Can you only build those from kit? Do they use special engines? What is the "Pylon" part? Is that the material they are made of?

6. As far as "extreme speed" prop planes: Are there special engines and planes used for this? Or can you take anything and make it into an extreme speed prop plane by modifying engine/prop/design etc...

I'd rather ask it all here all at once and hope someone answers than start a new post in each forum about it... Thanks! I know the questions may seem like common sense, and I've searched for exact definitions in the "abbreviations" thread but didn't see any. Maybe I missed it.