A monomial is a mathematical expression that consists of a single term. It can be a number, a variable, or a product of numbers and variables raised to non-negative integer powers. For example, 3x^2 and 7 are both monomials. Monomials do not include addition or subtraction, making them simpler than polynomials, which can have multiple terms. Monomials can be combined through multiplication and division. When multiplying monomials, you multiply the coefficients and add the exponents of like variables. For instance, multiplying 2x^3 and 4x^2 results in 8x^5. Understanding monomials is essential for working with algebraic expressions and equations in mathematics.