A die-cast car is a toy car made by pouring molten metal (usually zinc, aluminum, or a combination of both) into molds to form the car's body and parts. The term "die-cast" refers to the manufacturing process, where the molten metal is forced into a mold under high pressure, ensuring precision and durability. These cars are popular for their detailed designs, weight, and realism, making them a favorite among collectors and children alike.