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WD-40 is a versatile, all-in-one solution for lubricating, protecting, and removing moisture from a variety of surfaces and mechanisms. Developed in 1953, its name stands for "Water Displacement, 40th formula," indicating the number of attempts it took to perfect the formula. It is made up of a mixture of lubricating oils and other ingredients that provide a thin, non-greasy layer of protection against rust and corrosion. WD-40 is commonly used to loosen stuck or rusted parts, silence squeaky hinges, and clean and protect metal surfaces. It is also effective at displacing moisture from electrical systems and preventing them from shorting out. Its versatility and effectiveness have made it a household staple and a go-to product for maintenance and repair tasks.