The picture above is of a training drill. It involves players from two teams i.e. Team Red and Team Yellow with orange players at the outside.
The drill starts when a Red player dribbles the ball and plays it to the orange player at the outside. The orange player after receiving the ball, plays it back to the Red player. The Red player in the middle, after receiving the ball, plays it forward to the right side but plays it a little to far that it goes out of play and Orange player at the outside runs to receive the ball.
This drill is very useful in making the players used to the environment in real match scenarios which can be very useful at times.