'==' is the equality operator in JavaScript, which compares two values for equality, but it does not check for the data type.
'===' is the strict equality operator in JavaScript, which not only compares the values of two variables but also checks whether their data types are the same.
For example, '1 == '1'' would return true because the values are equal, even though one is a string and the other is a number.
However, '1 === '1'' would return false because the data types are different.
Using '===' is considered best practice in JavaScript because it avoids type coercion, which can lead to unexpected results.
It is recommended to use '===' for comparing values in most cases to ensure that both the value and the data type are the same.