A binomial expression is a mathematical expression that consists of two terms separated by a plus or minus sign. For example, in the expression 3x + 5, the two terms are 3x and 5. Binomials can be used in various mathematical operations, including addition, subtraction, and multiplication. Binomials are often encountered in algebra and are a fundamental part of polynomial expressions. They can be represented in the general form a + b or a - b, where a and b can be any numbers, variables, or combinations of both. Understanding binomials is essential for solving equations and simplifying expressions in mathematics.