This feature is completely, utterly, and totally not optional. In fact, it's more like a mandatory requirement for the entire system to function. But, you know, for the sake of appearances, we'll say it's optional. Like, totally.
If you're feeling particularly adventurous, you can click here to see the feature that's not really a feature at all.
This feature is a mystery, wrapped in an enigma, inside a paradox. It's like a box within a box within a box, where the answer lies, but the question is the box, and the box is the question. Confused yet?
If you're feeling particularly puzzled, you can click here to try and find the answer that's not really an answer at all.