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A die casting core is a movable part of the die that creates internal features or cavities within a cast part. It serves as a mold section that defines the interior shape of the part being produced. Typically made from steel or other heat-resistant alloys, cores are designed to withstand the extreme temperatures and pressures associated with the die casting process. They are often utilized to create hollow sections, complex geometries, or features that cannot be achieved through standard molding techniques.