There are two types of data types in JavaScript. JavaScript, also known as ECMAScript specifies six primitive data types and object (or) non-primitive data types
1. Primitive data type
2. Non-primitive (reference) data type
JavaScript has dynamic types. This means that the same variable can be used to hold different data types:
var x; // Now x is undefined
var x = 10; // Now x is a Number
var x = "Name"; // Now x is a String
