What is an expression that is a number a variable or the product of a number and variables?

An expression that qualifies as a number, a variable, or the product of a number and variables is known as an algebraic expression. For example, (3x) is an algebraic expression where (3) is a number (coefficient) and (x) is a variable. Other examples include simple constants like (5) or variables like (y). Overall, algebraic expressions can consist of numbers, variables, or their combinations through multiplication, addition, or subtraction.