A pick and roll is one of the simplest offensive plays in basketball, also known as an on ball screen, and it is designed to get a teammate open on the court. In a pick and roll, two players are required to make a screen and a cut. The pick-and-roll is when an offensive player gets a screen from a power forward or center, and they roll off of the defender they're screening to the basket. If they are open after rolling towards the rim they receive a pass and easy bucket.
A screen is a move in basketball where you block the movement of an opposing player with your body without making illegal physical contact. On a screen, the screener gets into position and plants his feet on the floor acting like a wall to prevent the other player from getting through. An effective screen will allow your teammate to get into open areas on the court creating offensive options. The players that are often used in these situations are point guards dribbling the ball with power forwards and centers setting the screens.
You can learn more about screens in Basketball Screens.
If you want to master the pick and roll, make sure to follow these steps:
There is a variation of the pick-and-roll play, which is called the pick-and-pop. In the pick-and-roll, the screener will usually roll to the basket, but in a pick-and-pop, the screener will pop out for a jump shot. This variation is used a lot in today's modern NBA, especially for point guards passing to power forwards or centers popping out for a three-point shot.