At school, Matt is asked to go and find a book in the library. Matt does not know where the book is. So he looks up the book on a computer. The computer has a list of all the books in the library and where they are. This sort of list is called a ________.

There is a wide range of computers. Some are big and you can see them. Others are very small and are hidden away inside machines. Computers have many uses. They can do lots of different jobs. New ways of using computers are being found all the time.