There is a big red square painted on the school playground. Mrs Smith is a teacher. She takes her class out to the playground. Mrs Smith gives instructions about how to walk once round the big red square.Mrs Smith asks Alice to stand at one corner of the big red square. Mrs Smith tells Alice to walk to the next corner of the square. She then tells Alice to turn right.What is Mrs Smith’s next instruction to Alice?

Computers are machines. They use electricity to make decisions. Computers have to be designed and built. Then when they are built, they have to be told what to do. That’s where algorithms come in. The definition of an algorithm is a list of steps to solve a problem or to get something done.