Computers are everywhere: at school, in our homes, and in factories and offices. Many people have a mini-computer in their pocket! This engaging series looks at computers and their uses, with an emphasis on the STEM principles that underpin how they work. Computers can carry out a lot of tasks, but they need instructions. Computer programming is the process of telling a computer what to do. The instructions are called programs and are written in code, which are the letters and numbers that make up the instructions. Find out about codes and programs, the people who write them, and how computers follow them.