You have two sides, one out in the field and one in.
Each player that's in the side that's in goes out, and when he's out he comes in and the next player goes in until he's out.
When they are all out, the side that's out comes in and the side that's been in goes out and tries to get those coming in out.
Sometimes you get players still in and not out.
When a player goes out to go in, the players who are out try to get him out, and when he is out he goes in and the next player in goes out and goes in.
There are six balls in an over, and when an over is over, there is another over.
There are two players called umpires who stay out all the time and they decide when the players who are in are out.
When both sides have been in and all the players have been out, and both sides have been out twice after all the players have been in, including those who are not out, that is the end of the game!