In the Harry Potter books, magic is depicted as a natural force, one that can be used to override the usual laws of nature while still being approached entirely scientifically. Many magical creatures exist in the series, as do ordinary creatures which exhibit some magical properties (such as owls, which are used to deliver mail). Objects, too, can be enhanced or imbued with magical power. Humans with the ability to perform magic are referred to as witches and wizards, in contrast to the non-magical Muggles.
In humans, magic or the lack thereof is an inborn attribute. It appears to be
semi-inherited, as magic is the norm in the children of magical couples and rare
in those of Muggles. Exceptions do exist: those unable to do magic who are born
to wizarding parents are known as Squibs, whereas witches and wizards born to
Muggle parents are known as Muggle-borns. The latter form are far more common
than the rare Squibs, but this may be a function of the disparate sizes of the
Muggle and Wizarding populations.
For a person's ability to perform magic to be useful, a good deal of training is
required. When 'wild,' typically with young and unschooled children, it will
still manifest itself subconsciously in moments of strong apprehension, fear or
anger [1]. For example, Harry Potter once made his hair grow back after a bad
haircut, and made the glass front of a boa constrictor's cage disappear.
Almost all magic is done with the use of a supporting tool or focus, typically a
wand. Some indications exist that a wizard's powers are more powerful or focused
when using a wand specifically compatible with their own temperament, although
any one seems to do in a pinch.
It should be noted that within the Harry Potter books, the technical details of
magic are, intentionally or not, entirely obscure. Of Harry's lessons only those
involving magical creatures, potions or divination are given in any detail, and
none of the clearly magical lessons are shown with any structure. In Fantastic
Beasts and Where to Find Them a creature called a Chizpurfle is said to consume
both magic and electricity, which may imply that magic is a molecular force. In
Harry Potter and the Goblet of Fire Hermione tells Harry and Ron that
electricity does not work near Hogwarts as there is too much magic in the air,
which would tend to support this idea.
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