Tic-tac-toe, also known as noughts and crosses, is a classic paper-and-pencil game played on a square grid typically consisting of three rows and three columns. The objective of the game is to be the first to create a straight line of three of your own marks, either horizontally, vertically, or diagonally. Tic-tac-toe is a simple yet engaging game that can be played quickly, making it suitable for casual entertainment, as well as a means of introducing basic strategy concepts to players of all ages. Its simplicity and familiar gameplay have made it a popular choice for passing the time and developing critical thinking skills.