Wicca, is a modern pagan religion created at the 20th century. It is said from its creator that it is based on an ancient pagan religion that gone extinct.
There are many different deities in that religion, in which the believer is said to be able to choose which path will he follow and thus deity. Most well known deities of wicca are the Horned God and Goddess, with the goddess aspect beeing famous with the name "Tripple Goddess".
Magick is a part of that religion, acknowledged as a natural force. In the occult, the magick used by people of this religion is categorized as "Earth Magick" or best known as "Witchcraft" and of course "Low Magick", in contrast to the kabalistic one which is labeled as "Ritual Magick" or "High Magick".
It became very popular, as many people turned to magick and "the old ways".
Feel free to ask anything else you wish.