What is the difference between == and === ?

In web development, especially in JavaScript, == and === are comparison operators used to compare values. Here’s the difference:

1. == (Equality Operator):
   • The == operator checks for equality of values after performing type coercion. Type coercion means converting the data type of one operand to match the data type of the other operand before making the comparison.
   • For example, 1 == '1' will return true because JavaScript will convert the string '1' to a number before making the comparison.
2. === (Strict Equality Operator):
   • The === operator checks for equality of values without performing type coercion. It means both the value and the data type must be the same for the expression to be true.
   • For example, 1 === '1' will return false because even though the values are the same, their data types are different (number and string).

In summary, == performs type coercion before comparison, while === does not. It’s generally considered best practice to use === for comparisons in JavaScript to avoid unexpected behavior due to type coercion.