The McDonald brothers opened the first McDonald's restaurant in 1940 as a hot dog stand in California. They realized hamburgers were their most profitable item so changed to focus on a limited hamburger menu. McDonald's began rapidly expanding internationally in the 1970s and now has over 36,000 restaurants worldwide. While known for its brand awareness and global presence, McDonald's faces challenges including health concerns, competition, and keeping up with changing technology and customer demands. The company has responded by improving food options and using technology to streamline operations and enhance the customer experience.