Nylon-string

Nylon-string guitars are less common than steel-string guitars but have a very unique sound. Mostly used for classical, flamenco, Spanish, bossa nova, and jazz music you can see them around if you know what to look for. They have a different machine head and bridge to hold and tune the nylon strings.

For some further reading on specifically the nylon string guitar check out:

https://www.musicradar.com/news/guitars/a-history-of-nylon-string-guitars-607574