Variables A variable is a quantity that may be changed according to the Mathematical problem. The generic letter that are used in many algebraic expression and equations are x, y, z in other words a variable is symbol for a number were the Value is not known. For example, x+5=10 In mathematics, an algebraic expression is an expression which consists of the combination of variables, constants, coefficients, fundamental operations such as addition, subtraction, multiplication and division. Each term constitutes the basic of algebra. In this article, let us discuss the term “ Variables” in detail. Here the variable definition, types of variables, its properties and examples are explained. Variable is a characteristics that can be measured and that can assume different values. Some of the variables are like Height, Age, Income, province or country of birth, garden obtained at school and type of housing, those are examples of variables. Variables may be classified in to two main categori