Automobile A-pillar refers to the pillars on both sides of the front windshield of the automobile, and automobile B-pillar refers to the pillar between the front and rear doors of the automobile, connecting the roof and chassis of the automobile.

Equipped with light-powered and self-propelled wheeled road vehicles, it was not like this at the beginning of invention, and the development of automobiles has a long process.

After 100 years of continuous improvement and innovation, it has condensed the wisdom and intelligence of human beings. Thanks to the support of many industries such as petroleum, steel, aluminum, chemical industry, plastics, machinery and equipment, electric power, road network, electronic technology, finance and so on, it has driven their development and become a wide variety of vehicles with complete specifications and widely used in various fields of social and economic life.

Since 1970, the number of global automobiles has almost doubled every 15 years, and the global automobile production in 20 13 years was 87.38 million.