This instructional video explains to the young chess player the special move of castling. In the video, the teacher explains why a player would want to castle, king's side castling, queen's side castling and when castling is not allowed.
When a player castles the king piece, the king is better protected from attack. When a player castles, the king moves two spaces toward the rook and the rook jumps over the king and sits beside it. When the king moves toward the rook closest to it, this is a king's side castle. When the king moves toward the rook closest to the queen this is a queen's side castle.
The video explains when castling is allowed such as when the king and rook have not moved yet and there are no pieces in the way. Likewise, the king cannot castle if the move puts the king in check or if the move puts the king in a position to be attacked.