paper airplanes glide while most real airplanes have a source of propulsion also in a paper air plane you fold, it in a real airplane you weld it together
A kite is a toy that is kept in flight by the wind not far from the earth's surface. An airplane is a a motorized means of long distance transportation that has motors that make it possible to stay in flight at high altitudes.
The difference is surely that an arrowhead has one reflex internal angle where a kite does not.
the shape
The aerodynamics of a kite involve the interaction between the kite and the wind. When wind flows over the kite's surface, it generates lift due to the difference in pressure between the upper and lower surfaces, similar to an airplane wing. The design, shape, and angle of the kite, known as the angle of attack, influence how effectively it can harness the wind. Additionally, drag forces act against the kite's motion, and a well-designed kite balances lift and drag to maintain stable flight.
the shape
You can hang off a hang glider but you can only fly a kite.
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They are both 4 sided quadrilaterals but a kite has no parallel sides whereas a parallelogram has opposite parallel sides
to keep the kite secure and steady
The dimensions of each one are going to have some bearing on the answer.
the kite
The cast of Paper Kite - 2013 includes: Shuyi Wang as Mina Mo