Rabbit toys
Rabbit or Dual Stimulation vibrators have two shafts, a bigger one for internal stimulation and a smaller one which, once the toy is inserted, lies on the clitoris for external stimulation. Typically the two shafts have different motors (speeds and moods) you can control as you like. Some models also have the "lift" mode, which add an extra movement to better reach the G Spot.
Finger toys
Control is in your hands, more precisely fingers, with this vibrators. They slide over your fingers following your movement and adding vibes to your play.
Clitoral toys
Clitoral vibrators usually are compact and stay in your hand. Created for specific external stimulation of the clitoris, there are two different kind of clit toys: the ones using different speeds and vibrations modes and the last released on the market, which use a technology with sonic waves to stimulate the entire clitoris (not just the head - read clitoris section if you want to know more about the real shape of the clit!).
Couple toys
"U" shaped couple vibrators are worn by women during penetration to have an extra stimulation of both clitoris and G Spot. Couple toys have not only different speeds and modes but also can be controlled by remote, for hands free play. A very recent and non-intrusive couple toy is the Eva by Dame Products model: it sticks to the clitoris, allowing easy penetration, hands-free play and intense external stimulation. Read more on how to use couple toys here.
Panty toys
Panty vibrators are worn in underwear for hands free external-clitoral play (usually controlled via remote control or app).
G spot toys
G Spot vibrators have one shaft and multiple modes and speeds; usually these sex toys curve up-word and/or have girth head to better stimulate the G Spot inside the vaginal canal. Modern versions also have the "lift" feature simulating penetration and the "come here" motion.