Identically Equal and Not Identically Equal : Relational Operators « Operators « JavaScript Tutorial

The identically equal and not identically equal operators do the same thing as equal and not equal,

except that they do not convert operands before testing for equality.

The identically equal operator is represented by three equal signs (===) and only returns true if the operands are equal without conversion.

var sNum = "55";
var iNum = 55;
alert(sNum == iNum);    //outputs "true"
alert(sNum ==="iNum);   //outputs "false"">

2.9.Relational Operators
2.9.1.Equal and Not Equal
2.9.2.Equal Operator
2.9.3.A Comparison Operator returns boolean variable
2.9.4.!= (Not Equal)
2.9.5.Identically Equal and Not Identically Equal
2.9.6.not identically equal operator
2.9.7.!== (Non-Identity)
2.9.8.< (Less Than)
2.9.10.> (Greater Than)
2.9.11.>= (Greater Than or Equal)