The violin above has a few features that are...unconventional. It is painted, the scroll shape is unusual, the pegs are geared, the chin rest is center-mounted, and it has frets. read more
Frets do several things. One is about ease of playing. Finger placement is both easier, in that it is marked, and less critical, in that the fret itself defines the actual resonating length of the string, even if the finger is a half inch off. read more
The frets of a guitar do not do all the work. They perform the task of keep the string in tune. If a guitar player performs a bend, dive, or vibrato (limited but still an issue), he is sort of on his own with regards to pitch. read more
The frets enable you to change the length of the strings this make them produce a different sound. (vibrate at a different frequency) They make the string vibrate more than your finger does when you press on the guitar. The frets enable you to change the length of the strings this make them produce a different sound. read more