Tic Tac Toe is a classic and simple two-player game that is played on a 3x3 grid. The objective is for players to take turns marking spaces on the grid with either an "X" or an "O," aiming to align three of their marks in a row, either horizontally, vertically, or diagonally. The game ends when one player achieves this goal, or when all the spaces are filled without a winner, resulting in a draw. This game is known for its easy-to-understand rules and quick playtime, making it a popular choice for all ages.