I made a professor essay writing on this topics so I can add that the strings are much closer to the neck than in an electric guitar, allowing your fingers to glide more easily and thus reduce the strain on your hand. A bass guitar without frets has the same principle as producing sounds on a double bass. The string is vibrated with the right hand, and the left hand moves along the neck, extracting the necessary notes. The result is a lively, melodic sound that can only be achieved with the help of a fretless instrument.