Alderson disk is a kind of disk that is used to help understand how computers work. It was invented by Alan Turing, who was a famous scientist. The disk has a lot of tiny holes in it, and inside of each hole is a number. When the disk is put into a computer, the computer will look at each of the holes and its numbers to find out if the computer should do something or not. In this way, the computer can be instructed to do specific tasks, like make a webpage or play a song.