Have you ever played with Legos? Just like you can build different things with Legos by following instructions, a computer can do different things by following instructions too, but really super-fast.
Super-threading is a way to make the computer do even more things at once, by breaking up the instructions into really, really tiny pieces (called threads), and having the computer work on multiple threads all at the same time. It's like having multiple people work on different parts of a big Lego project all at once, so it gets done much faster.
By super-threading, the computer can switch between different tasks very quickly and efficiently, just like how you can switch between playing with different sets of Legos quickly and easily. This makes things run faster and smoother, so you can get more done in less time!