Someone who's revived has come back to life or consciousness. A revived drowning victim might cough up water and start breathing again.
You can describe yourself as revived if you're feeling a renewed sense of energy, too: "I am feeling so revived after that good night's sleep!" Things can be figuratively revived when they seem to come back to life, like a revived religion that more people are joining, or a revived language that kids are increasingly learning to speak. The Latin root, revivere, means "to live again."