Terms in an expression could be a number, a variable (letters like x, y, z, a, b, etc.), or a product of numbers and variables together. Terms may also come with exponents.
Examples of terms are:
Numbers: 8, 19
Product of a number and a variable: 2x, 3ab, 4xy, 10a⁴b⁵
Product of two or more variables: x²y³, abc², xy⁴