What is the game called with a white line and a red ball and you try to get the ball into a square?

The game you're referring to is likely "pool" or "billiards." In these games, players use a cue stick to strike a colored ball (often red) and aim to sink it into one of the pockets on a rectangular table, which is often marked with a white line. The objective is to score points by successfully pocketing the balls according to specific rules.