Variable is anything which is not consistent.
In computer science, a variable is a block of memory where numbers or characters can be stored. Typically, the programmer gives this block a name and the program decides where this block will reside in memory, after the execution of the code.
Variables are used to store information, there are several types of variables, and some are exclusive for a certain language. Some of the types are integer variables, character variables, and float variables.
Different types of variables:-
Integers − are whole numbers, without a decimal point, like 4195.
Doubles − are floating-point numbers, like 3.14159 or 49.1.
Booleans − have only two possible values either true or false.
NULL − is a special type that only has one value: NULL.
Strings − are sequences of characters
Arrays − are named and indexed collections of other values.
Objects − are instances of programmer-defined classes, which can package up both other kinds of values and functions that are specific to the class.