It's the Magic In Your Blood

Wizard/Witch	Has magic in their blood and is able to do magic themselves
Muggle	Has no magic in their blood
Pureblood	Has no connection with muggle blood what so ever
Halfblood	Has one muggle parent, or history of muggle blood in ancestry
Muggleborn	A wizard or witch born to muggle parents
Squib	Child born to magic parents but can't do magic themselves, but can sense it

In the case of Dementors, Muggles can not see or sense them, squibs can only sense them, and wizards and witches can see them and protect themselves against Dementors.

The Power of Flight

Spell Name	Incantation	Description	Wand Movement
The Levitation Charm	Wigardium Leviosa	Allows caster to control all directions of an object, most effective. Inventor: Jarleth Hobart	Swish and flick
The Floating Charm	Fluito	Allows caster to control height of object, best used for cleaning	Jab and Upward flick
The Rocket Charm	Alarte Ascendare	Shoots object straight up and back down	Quick Swish at the end
The Hover Charm	Levioso	Allows the caster to contorl height of object, must be touching.	Inward Spiral then Up

Harry Potter is believed to once take flight without any magical device, but we are unsure if that is true.

Always Good to Know

The important thing is to remember the incantations pronunciations are critical, they will cause negative side effects. Spells always require feeling, thought, and/or desire. You also need to visualize. But remember that power is not a direct measure of strength.