How do objects such as kites, birds or planes stay in midair without falling even though they are heavier than air? The answer can be explained in terms of a force, lift. Lift is a mechanical force that has both magnitude and direction, so it is a vector quantity. Lift acts in the direction perpendicular to a flying object and lift acts on its center of pressure. It is the opposing force to weight. Lift is generated when a solid object makes contact with a fluid. In the case of kite flying, the object is the kite and the fluid is air.Thus, when the lift of an object is greater than its weight, it will coast through the fluid in which it is immersed.

Without fluid, there is no lift. Without motion, there is also no lift. Motion is the direction in which the object is moving. Lift occurs when a solid object turns the flow of a liquid, causing air to flow both above and below the object. A moving kite will deflect air to the underside of the kite. The air flowing towards upperside moves faster than the air flowing below the kite. Air flowing above it puts less pressure on it than the air flowing below it because it is moving faster. The kite can't flow in the direction of the wind because it positioned perpendicular to the wind motion (by the kite-flyer) so it has to go upwards.

Simply put, you can think of a kite as something that catches the wind, like a sail on a sailboat.