A variable is a term used to express the unknown value or quantity.
A variable is an alphabet or term that represents an unknown number or unknown value or unknown quantity. It is used when we do not know the actual value of the number or the quantity.
For example: let x denote the number of hours taken by Sam to complete his work.
When we have to plot the variables on x- axis and y- axis, we see that which variables are independent variables and which of them are dependent variables.
The independent variables that are not influenced by the other factors that are given are plotted on the x- axis and the dependent variable which changes due to the change in independent variable are plotted on the y- axis.
Therefore, a variable is a term used to express the unknown value or quantity.
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