With young and untrained children, magic will manifest itself subconsciously in moments of strong emotion: apprehension, fear, anger and sadness. Witches and wizards train to learn how to control their magic. The exhibition, entitled Harry Potter: A History of Magic, is the first at the British Library to be inspired by a single series by a living author. The magic of Harry Potter became the subject of a 2017 British Library exhibition and accompanying documentary. The books present the idea that the Muggle interpretation of these stories is a distorted version of what goes on in the wizarding world. She has described this as 'a way of giving texture to the world'.

Rowling based many magical elements of the Harry Potter universe on real-world mythology and magic. While Muggle-borns are quite common, Squibs are extremely rare. Exceptions exist: those unable to do magic who are born to magical parents are known as Squibs, whereas a witch or wizard born to Muggle parents is known as a Muggle-born, or by the derogatory term 'Mudblood'. Magic is the norm for the children of magical couples and less common in those of Muggles. It is usually inherited, carried on 'dominant resilient genes'. In humans, magic or the lack thereof is an inborn attribute. Witches and wizards refer to the rest of the population, who are generally unaware of magic, as ' Muggles' in the United Kingdom and 'No-Maj' in the United States. Many fictional magical creatures exist in the series, while ordinary creatures also sometimes exhibit magical properties. Rowling's Harry Potter series, magic is depicted as a supernatural force that can be used to override the usual laws of nature.

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