What is the main difference between '==' and '===' in JavaScript?

The main difference between '==' and '===' in JavaScript is that '===' compares both values and types, ensuring strict equality. When using '===', JavaScript checks whether the two operands are of the same type and equal in value, which prevents unintentional type coercion. For example, if you compare the string "5" with the number 5 using '===', the result will be false because they are not the same type.

In contrast, '==' allows for type coercion, meaning that if the operands are of different types, JavaScript will attempt to convert them to the same type before making the comparison. Using '==' to compare "5" and 5 would yield true because JavaScript converts the string "5" to a number before comparison.

Understanding this distinction is crucial for avoiding unexpected behavior in your code, particularly in situations where type integrity is important.