== ignores the datatype of variable and === does not it.

Example:

4 == "4" => true
4 === "4" => false
4 === 4 => true

1. ‘==’ : it does the necessary type conversions before doing the equality comparison.
   Ex:
   1 == ‘1’ => True
   1 == 1 => True
   1 == ‘5’ => False
2. ‘===’ : it will not do the type conversion hence if the two values are not of the same type, when compared, it will return false

Ex:
1 === ‘1’ => False
1 === 1 => True
1 === ‘5’ => False

In detail Example

0 == false // true
0 === false // false, because they are of a different type
1 == "1" // true, automatic type conversion for value only
1 === "1" // false, because they are of a different type
null == undefined // true
null === undefined // false
'0' == false // true
'0' === false // false

Check this video which explains clearly,

https://www.youtube.com/watch?v=S7p9QStPUGo

Thanks.