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In-N-Out Burger is a popular American fast-food chain that has been serving its signature Double-Double burger since 1948. Founded by Harry Snyder and Esther Snyder, the restaurant has maintained its family-owned business model for over seven decades.

The menu features a simple yet iconic lineup of burgers, fries, and drinks, with a focus on high-quality ingredients and made-to-order preparation. Their signature items include the Double-Double (two patties, American cheese, lettuce, tomato, and spread), the Hamburger (a single-patty version of the Double-Double), and the Protein Style, which swaps the bun for a lettuce wrap.

In-N-Out Burger has gained a cult following in the western United States, particularly in California. The restaurant's commitment to using only fresh ingredients, cooked-to-order, and its transparent menu have contributed to its loyal customer base. A "Not So Secret Menu" exists among regular customers, which includes modifications such as grilled onions, grilled mushrooms, or extra pickles.

While some may attribute the chain's success to its limited but simple menu offerings, others praise In-N-Out Burger for its dedication to quality and tradition in a rapidly changing fast-food industry.