What makes a constant term different from a term with a variable?

A constant term is a fixed value that does not change, such as 5 or -3, whereas a term with a variable includes a letter that represents a value that can change, such as 3x or -2y. The presence of a variable allows for the expression to represent multiple values depending on what the variable stands for. In algebraic expressions, constant terms contribute to the value but do not vary, while variable terms can adjust the overall value based on their assigned numbers.