Within the magical wizarding world of Harry Potter, there are many ways to get about, such as a train or flying car, or even the trusty broomstick.
If you are looking to get from one home to another, then Floo Powder may do the trick, and there is also the use of a portkey to get from one fixed point to the next. But within the world of magic, there seems to be nothing better than simply apparating to where you wish to be. It may not be the sneakiest way to travel as it is often accompanied by a popping sound, though one fan has proposed a theory that this is only the case for the unskilled.
Apparition is an advanced form of magic used to transport someone from one place to another almost instantaneously. Much like getting your driver’s license for us mere muggles, wizards and witches must wait until they are old enough to learn the spell and obtain their license after proving they have mastered it. If performed incorrectly, it can lead to some truly gruesome results known as splinching, where part of the body is left behind.
It plays a huge role within the books by bringing attention to the underestimated house elves. The little critters also have their own magic and are able to apparate as well, but because their magic is overlooked, wards that are used against apparition do not exclude them. It is because of this oversight that Kreacher apparates Regulus Black into Voldemort’s cave to retrieve the Horcrux, and because of Dobby, Harry and his friends are rescued from Malfoy Manor.
Apparating is like any form of magic, the more skilled the user, the better the spell.
Many think that this is an excellent theory, and are more than happy to take this on as fact (though still in the fictional sense of course).
One user added to the theory, using examples of when this can be seen.
Though this all takes place in the world of magic, some have added science into the mix, building on what Rowling said regarding the displacement of air.
One fan has a great analogy to help understand this concept.
Some think that the Weasley twins’ loudness is a choice to shock and unbalance those around them.
A few went to defend poor Mundungus Fletcher, whom the OP really went for.
Overall the theory was well liked by fellow Harry Potter fans on Reddit. In a world where magic exists, science also still exists, and it is interesting to see the two interact in this way.