Muggles, also known as No-Majs in the United States, are people who are not born with magical powers and cannot perform magic. They are often ridiculed by wizards and witches for their lack of magical ability.
It is important to note that there are many different kinds of Muggles who live in the wizarding world. Some Muggles are aware of the existence of magic, while others know nothing about it. Some Muggles have even been trained to use some basic spells, such as Lumos and Incendio.
Muggle-borns are witches and wizards who were born to two Muggles or Squibs, or had one Muggle parent and one magical parent. They share some similarities with Squibs, but have more in common with half-bloods than with purebloods. However, unlike half bloods, they cannot see Thestrals until they have witnessed death.
Muggle-born witches and wizards cannot perform magic until they receive their Hogwarts letters; at that time, their wands will be able to perform simple spells without fail for as long as the wizard or witch does not choose to stop using them (i.e., if a muggle-born chooses not to use his/her wand after receiving it at eleven years old, it will no longer function properly).
