The BBC micro:bit is a pocket-sized computer that introduces you to how software and hardware work together. It has an LED light display, buttons, sensors and many input/output features that, when programmed, let it interact with you and your world.
There are many online resources available on this topic. Check out these resources here. Also look at the databases and the online encyclopedias available under the Online Resource tab above. Here is a note-taking sheet to help you with your work.