What is apparated?

Apparation is a magical ability in the fictional world of Harry Potter, where wizards and witches can teleport themselves to any location without the use of Hogwarts Express or broomsticks. It requires a license and a strong mastery of the spell, which can be dangerous if performed clumsily. A person can only apparate to a location that they have physically visited or have a clear picture of in their mind. It can also be blocked by certain magical enchantments and wards. The act of apparating involves a brief moment of disorientation and a loud popping sound.