A magician uses the term magic to describe the illusions he presents to his audience. Magicians fool his audience with trickery because all of his “magic” can be explained. Real magic should not be explainable. To use the term magic, itself, would be the only reason for an unexplainable event. If there is no logic to determine the cause of an event then it is reasonable to suggest that what is going on is caused by magic.
Magical elements for witchery/wizardly include spells, incantations, and potions. The people who perform these have deep beliefs that what they are doing will cause something due to what the ingredients are in a potion as well as the incantation that goes along when creating it. If someone were to drink this potion and get warts on their face then magic could be used to describe why the potion caused the warts.