A selection of vibrators.
Vibrators on shelf in a UK pharmacy.
A vibrator is an electric sex toy that vibrates when switched on. Most vibrators resemble dildos, but vibrators are often more sophisticated in their shape. Modern vibrators are generally battery-operated, waterproof, and their vibration (and, possibly, other motion such as bending or rotation) can be adjusted with buttons or thumb wheels.
Vibrators are mainly used for the stimulation of female erogenous zones such as the vagina or clitoris, but can also be used for all other erogenous zones (e.g. the nipples or anus).
There are also vibrating eggs called love eggs (which can be inserted, e.g. into the vagina or anus), vibrating butt plugs, and other variants of vibrating sex toys.