yes it can be played outside but it is also bad for the ball.
Yes.
You play basketball indoors because if the floor gets wet you wont be able to run or jump
I like the Wilson Ultra ball. It has a good bounce and breaks in nicely, but the best part is the feel. Because of its sponge rubber underlayer, it has and indoor feel but wears like an outdoor ball....
indoor
Yes, in the NBA, NCAA, and FIBA, Euroleague Basketball, etc. Games played outdoors are considered "streetball".