Different between == and === operators in javascript

When declaring a variable we have two parts they are data type and value

 var age = 18; // dataType = number, value = 18 

So == operator only compare value and === compare both value and datatype

 var age = 18; // dataType = number, value = 18
var myAge = "18"; // dataType = string, value = 18

age == myAge; // True
age === myAge // False  

See demo

Here are the important differences between == and ===

This is some view point from me about them, I hope it useful for you.

•  == is used for comparing two variables, but it ignores the datatype of the variable whereas === is used for comparing two variables, but this operator also checks datatype and compares two values.
• == is called as a comparison operator whereas It is also called as comparison operator.
• == Return true only if the two operands are equal while === returns true only if both values and data types are the same for the two variables.