Can someone explain the concept of these to me? And what worlds are they/how do you know if you've been switched to one?

Jagex transfers your account to word 385 or 386 and watches your activity closer under suspicion of botting, you know if you've been switch to one if there's a sudden rush of people at the place you're at (like 50 other bots at yew trees) and you are in w385 or 386 

 

if (client.getCurrentWorld() == 385 || client.getCurrentWorld() == 386) {

log("We're on bot world oO");

hopWorld();

}

I wish I had acquired this information prior to a permanent ban on my main account.

Can someone explain the concept of these to me? And what worlds are they/how do you know if you've been switched to one?

w385 and w386 are bot worlds. When Jagex suspects your account of botting, they will transfer you to one of those two worlds. You can tell that you are in those worlds when you notice that you are in those worlds.

That's some sneaky shit, Jagex.