Triple equal '===' means equivalent in value and in type. Double equal '==' means equivalent in value.

Try this: in your browser console, type
1 == true

true
1 === true
false

Also try this:
5 == '5'

true
5 === '5'
false

The reason for these answers is that number 1 is 'truthy' as they say, and is equal to the value of true, but the type of 1 is a number, and the type of true is a boolean. Similarly, the type of 5 is a number, and the type of '5' is a string, even though their values are equal.

Excellent explanation! Comments like these make codewars a great place to learn how to code.