Expression evaluation is the process of determining the value of a mathematical or logical expression. This involves interpreting the symbols and operators within the expression, following specific rules of precedence and associativity. For example, in the expression 3 + 5 * 2, the multiplication is performed first, resulting in 3 + 10, which equals 13. In computer programming, expression evaluation is crucial for executing code. Programming languages use expression evaluation to compute values during runtime. This can involve various data types, such as integers, floats, and strings, and may include operations like addition, subtraction, and logical comparisons.