Events that occur and forces that exist outside of physical laws as we currently understand them. Things that are commonly described as supernatural or paranormal include deities, ethereal beings (demons, angels, ghosts, spirit guides, etc.), magic, psychic phenomena, and divination.
It's important to remember that many people engaged in paranormal activities do not necessarily consider what they are working with to be unnatural. These forces are seen as being a part of nature but simply not well understood by science. In fact, some practices such as astrology and alchemy are commonly called "pseudo-science" because they do not hold up under current scientific standards but were once commonly accepted as scientific.