Variable is a computer programming term which refers to a named memory location (storage) which contains data or values. The variable name is used as reference of storage value.
It is called variable because the represented values can change but the operation on the variable remains the same.
A variable is composed with a variable name and a data type. Data types determines the types of value such as integer, float, character etc. it can hold.
There are naming conventions of variable name that must be followed to compose a variable name.
Example:
int a, b c; a=b+c;
Variable is a condition or factor, usually in an experiment, that is capable of changing or being changed.