What is the difference between comparison operators?

== (loose equality) compares values by attempting to convert them to a common type if they are different. This can lead to unexpected results. === (strict equality) compares both values and data types without type conversion. This comparison is generally more predictable and safer.

Examples:

// Loose equality
console.log(1 == '1'); // true (string '1' is converted to number 1)
console.log(null == undefined); // true

// Strict equality
console.log(1 === '1'); // false (different types)
console.log(null === undefined); // false

Differences table:

Operator	Comparison type	Type conversion	Predictability
==	Loose	Yes	Low
===	Strict	No	High

In most cases, it is preferable to use === to avoid implicit type conversion and related errors.