The "IF...THEN" condition is a fundamental concept in logic and programming. It establishes a relationship between two statements, where the first statement (the condition) must be true for the second statement (the result) to occur. For example, "IF it rains, THEN the ground gets wet." Here, the wet ground is dependent on the condition of rain. In programming, "IF...THEN" statements help control the flow of a program. They allow developers to execute specific actions based on certain conditions. For instance, in a game, "IF the player scores points, THEN display a congratulatory message." This structure helps create interactive and responsive applications.