This document discusses computer assisted instruction (CAI) and its uses in education. CAI refers to using computers to deliver instruction, through lessons presented on screen that students interact with by answering questions. It allows content to be presented through text, graphics, video and audio in a hypermedia format. Teachers can also create their own instructional software for activities like drills, spelling practice tailored to individual students, and simulations. While CAI allows rich, engaging content delivery at an individualized pace, it is controlled by machines and may not develop students' interpersonal or practical skills as fully as in-person instruction.