The data type of the variable defines the type of the value this variable can have.

The data type of the variable defines the type of the value this variable can have. Each data type represents some set of values. For example, int variable can have any integer value and Boolean can have true or false values.

Primitive Data types:

int, uint, Number, Boolean, String, Null and void

Complex Data types:

Array, Date, Error, Function, RegExp, XML, and XMLLis