<human>: What are the different types of acoustic guitars and what are their differences?
<bot>: The different types of acoustic guitars include nylon string, steel string, classical, electric, and archtop. Nylon string acoustic guitars typically have a softer sound than steel string models, with less sustain. Classical acoustic guitars usually have a deeper, more mellow tone, while electrics provide a brighter, more aggressive sound. Archtop acoustic guitars produce a bright, crisp sound with plenty of volume and projection.