In JavaScript, the == operator performs type coercion before making a comparison, while the === operator does not. This means that if you use ==, JavaScript will try to convert the operands to the same type before making the comparison.
For example, "5" == 5 will return true, because JavaScript converts the string "5" to the number 5 before making the comparison. However, "5" === 5 will return false, because the operands are not of the same type.
It is generally recommended to use the === operator for comparisons in JavaScript, as it provides a more predictable and consistent behavior. It also helps to avoid unexpected results caused by type coercion.
However, in some cases, using == can be useful, for example when comparing values with different types but that you want to consider equal, like comparing null and undefined.
In summary, use === operator when you want a strict comparison without type coercion, and use == when you want a comparison with type coercion.