The equation "X = 4" indicates that the variable X is equal to the number 4. In this context, X represents an unknown value that has been determined to be 4. This type of equation is commonly used in mathematics to express relationships between variables. In practical terms, if you have a situation where X stands for the number of apples, then "X = 4" means you have four apples. This simple equation helps in solving problems and understanding basic mathematical concepts, making it a fundamental part of algebra.