Who sells the most burger?

Can you please elaborate on the context behind this question, "Who sells the most burgers?" Are we referring to a specific region, country, or globally? Are we considering all types of burger sellers, including fast food chains, independent restaurants, food trucks, or even street vendors? Additionally, is this a question about quantity sold in terms of weight, number of burgers, or revenue generated? Without these details, it's difficult to provide a precise answer, but in general, some of the largest fast food chains globally, such as McDonald's, Burger King, and Wendy's, are known for selling a significant number of burgers annually. However, the exact ranking of who sells the most burgers would depend on various factors, including location, market share, and product offerings.