A sty is a little bump you get ON either eye on bottom eye lid or bottom. You know that it is a sty when you see a bump and it itches.
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A sty, medically termed Hordeolum, is caused by a plugged oil gland in the eyelid. If it's on the outer surface of the eyelid, it's a plugged meibomian gland. If it's deeper inside the eyelid, it's likely a plugged moll or zeiss oil gland. These tend to go away on their own, but you can use a warm washcloth to encourage the plugged gland to unclog.