It comes from the Greek word "hupér," which has the same meaning.
Here are some examples of words using the root "hyper-":
* Hyperactive: excessively active
* Hypertension: high blood pressure
* Hyperbole: exaggeration
* Hypersensitive: overly sensitive
* Hyperthermia: abnormally high body temperature
* Hypermarket: a very large supermarket
So, when you see the word root "hyper-" in a word, it usually indicates that something is in excess or above the normal level.