UL is mainly engaged in product safety certification and business safety certification business. Its ultimate purpose is to provide the market with a fairly safe level of commodities, and to contribute to the protection of personal health and property safety. In terms of product safety certification as an effective means to eliminate technical barriers to international trade, UL also plays an active role in promoting the development of international trade. UL was founded in 1894. In the initial stage, UL mainly relied on the fire insurance department to provide funds to maintain its actions. Until 1916, UL was completely independent. After nearly a hundred years of development, UL has become a world-renowned certification body. It has a set of strict organizational management system, standard development and product certification procedures. UL is managed by a council composed of representatives from security experts, government officials, consumers, education, utilities, insurance, and standards departments. The day-to-day work is handled by the president and vice president. Currently, UL has five laboratories in the United States, headquartered in the town of Northbrook in northern Chicago, and has established corresponding laboratories in Taiwan and Hong Kong. In the United States, for consumers, UL is a symbol of safety signs. Globally, UL is one of the most trusted qualification assessment providers for manufacturers.