The neck is usually a long thin section of a guitar that runs between the body of the instrument and the headstock. Necks vary in width, length and materials, depending on the size and style of a particular instrument. Necks may be unfretted, have frets set directly into them, or may have a separate fretboard attached.
In some instruments, such as mountain dulcimers, the neck runs on top of the full length of the instrument. In other instruments, such as a standard canjo, the neck also serves as the body.
On cigar box guitars, necks can be bolted to the box, run through it (neck-through style) or be mounted on top (neck-on-top style).