Classical Guitars are known for being one of the most common beginner guitars and are one of the oldest styles still being produced.
Classicals are known for wide fretboards, soft tone, and nylon strings. They are easy for beginners to learn with because of the soft strings. These guitars are definitely quieter overall than acoustics, although they are louder than unplugged electric guitars. These are also available in the widest range of sizes, from 4/4, 3/4, 1/2, to the smallest size, 1/4
Classicals are probably the best entry point for a young beginner guitarist.