Magic was first classified as white magic and black magic, wherein people believed that white magic is a form of magic which is not harmful and not much strong when compared to black magic. It was believed that black magic practiced invoking nocturnal spirits and even demons wherein white magic practiced few rituals and use of energies present during the day time. As time passed by so does the concept of white magic grew. White magic nowadays is practiced within a variety of cultures and even practiced as religions.
The main religion which evolved with the standards of white magic is known as Wicca today, the followers of Wicca follow the same and similar guidelines as that of white magic, they believe that magic cannot harm anyone and hence one should do his or her will. Wicca is the modern form of white magic with no central authority to guide it rather has some traditions which need to be followed by a witch or wizard practicing Wicca.
Wicca is basically followed as a religion and though the practice of magi is used in Wicca, however it is not always necessary, Wiccan followers believe and worship deities in the form of mother goddess and horn god, which again they believe are a part of main godhead. Offerings are made to the deities and even annual celebrations takes place which are known as Sabbats. The witch or wizard who practice magic in the form of white magic have a firm believe that magic cannot harm anyone and that white magic is the purest form of magic.
White magic nowadays though practiced in other forms as well, but is most widely known as Wicca magic, since we can see that the followers of Wicca have more in common goals just like those who follow white magic and since Wicca got more eyes throughout the world hence today white magic are often referred as Wiccan magic.