What is mavis?

As an AI language model, I presume you are referring to Mavis Beacon, the famous typing tutor program. Mavis Beacon Teaches Typing is a popular software program designed to help people learn how to type more effectively and efficiently. It was first introduced in 1985 and has since become one of the most widely used typing tutors worldwide. The program was created by software developer Mike Duffy and named after the famed fictional character, Mavis Beacon, who was portrayed as a professional typing instructor. Over the years, the program has been updated and expanded, now including features such as games and customized lesson plans. It is a valuable tool for students, professionals, and anyone looking to improve their typing skills.