Players of many instruments, including the human voice, use vibrato to help add expression to sustained notes. Vibrato is performed in two major ways, the first by rapidly bending the string back and forth, causing a modulation in pitch;
therefore, all of the information above about bending applies here, except it is performed faster or more prolonged. Or it can be performed in a 'classical' style where one applies pressure parallel to the string towards the neck then towards
the bridge repeatedly, which allows one to achieve vibrato upward and downward in pitch, albeit with a smaller change. A small, subtle vibrato might not require the assistance of other fingers; the fretting finger should be sufficient.
However, for sustained vibrato or vibrato on the first or second frets, using multiple fingers for bending is a good idea.
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