There are three major types of guitars. They are acoustic, electric, and bass. Acoustic are the most common, and are usually the types of guitars that people use when they are first taking guitar lessons.
Acoustic guitars come in two types.
They are classical and folk acoustic guitars. The classical type of guitar has nylon strings and the folk guitar has steel strings. The difference in strings results in a difference in sound. Folk guitars are usually bigger as well, and this can go hand in hand with the extra reinforcements that are needed because of its steel strings.