What is strict and non-strict comparison in JavaScript?

In JavaScript, there are two main types of comparison: strict (===) and loose (==).

• Strict comparison (===) checks for equality without type conversion. Values are considered equal only if they are of the same type and have the same value.

• Loose comparison (==) first converts (coerces) the types of the compared values to a common type, then compares. This can lead to unexpected results.

Example:

console.log(5 == '5');  // true, because '5' is converted to the number 5
console.log(5 === '5'); // false, different types (number and string)

Using strict comparison is recommended to avoid errors related to implicit type coercion.