Noughts & Crosses, also known as Tic-Tac-Toe, is a simple two-player game played on a 3x3 grid. Players take turns marking a square with either an X or an O. The objective is to be the first to get three of their marks in a row, either horizontally, vertically, or diagonally. The game is often used to teach basic strategic thinking and problem-solving skills. It can be played with paper and pencil or on various digital platforms. Due to its simplicity, Noughts & Crosses is popular among children and is often one of the first games they learn.