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EN 
Paint is to a car what skin is to a person: it shapes how the whole thing looks, and a scratch shows. Owners naturally want to shield it. Everyone wants a hard layer that keeps the outside world at bay.
The usual ways to protect paint are wax, glaze, coating and ceramic coating. Each protects differently, to a different degree, at a different price. Wax and glaze are much the same: glaze is a wax, but purer than natural mineral wax, with better adhesion and slip. Car wax oxidises easily, or rather the emulsifiers in it do, so it needs regular reapplication to keep the gloss.
A coating is generally an inorganic layer over the paint that UV and acid rain will not oxidise away. It typically lasts about a year.
A ceramic coating covers the paint with a crystal film. The material is inorganic silicon dioxide with a molecular structure small enough to reach nano scale, so it penetrates the pores of the paint and forms a bright glass-like layer that separates the paint from the air, raising both hardness and gloss.
What are the benefits?
1. Scratch resistance: it shields the car from everyday light scratches. Even when a force exceeds the film's elastic range, the mark usually stays in the coating rather than reaching the paint.
2. Corrosion resistance: by isolating the paint from the environment it resists oxidation, bird droppings, insect residue and acid rain.
3. Easy cleaning: the surface behaves like glass, so dirt rinses away far more easily.