The picture above is of training drill. It involves Yellow players on the left side who are the attacking side and Orange player on the right side of the picture act as the defending side.
The drill starts when the players on all the four side make runs towards the middle of the field. The Yellow players on the corners play a cross to the players who are running to the middle of the field. The Yellow players take a shot at the goal either by controlling it or trying a volley whereas the Orange players are trying to stop them by making a tackle.
This drill helps the players to improve their one time finishing ability and helps the defenders to prepare themselves to face this type of situations in real match scenarios.