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In-N-Out Burger is a popular American fast-food chain known for its simple menu and high-quality ingredients. Founded in 1948 by Harry Snyder and his wife Esther in Baldwin Park, California, the restaurant has remained committed to using fresh, never frozen beef patties and producing only about 300 different items at each location.

The menu features a variety of burgers made with their signature Double-Double and Hamburger options, as well as limited-time seasonal offerings. They are famous for their "not-so-secret" menu, which is not listed on the official website but can be ordered by customers if they know the right codes, such as "Protein Style" (swapping the bun with a lettuce wrap) or "Animal Style" (topped with grilled onions and Thousand Island dressing).

In-N-Out Burger also prides itself on its customer service. The restaurants are often visited by employees who work directly for In-N-Out Burger, rather than being outsourced to third-party companies like many other fast-food chains.

The chain has maintained a loyal following over the years, particularly in the western United States where they have gained cult-like status among locals and visitors alike. Critics praise their classic menu items for their simplicity and quality ingredients, while some argue that they lack innovation or variety compared to other burger chains.