In the book version of The Wizard of Oz by author and Oz series originator Lyman Frank Baum [May 15, 1856-May 5, 1919], the Wicked Witch of the East performs the magic of getting where she wants to be, no matter how far off, by
tapping the heels of her slippers together and saying out loud where she wants to be. The Wicked Witch of the West performs the magic of calling forth her helpers, by way of a
silver whistle for wolves, crows, and bees; and by way of a
special cap and spell for the winged monkeys.
In the 1939 film version, Glinda the Good Witch has a wand, which is what readers and viewers tend to expect as part of a witch's or wizard's necessary luggage and tools of the trade.
As a practicing Witch I would say the definition of Magic is the manipulation of naturally occurring powers by the mind and will of an ethical magical practitioner.
Therefore the only thing I need to practice magic is my mind and the knowledge and power stored therein.