An oil press is a machine used to extract oil from seeds, nuts, or fruits. It works by applying mechanical pressure to the raw materials, which causes the oil to separate from the solid components. Common sources for oil pressing include sunflower seeds, soybeans, and olive fruits. There are two main types of oil presses: cold presses and hot presses. Cold presses operate at lower temperatures, preserving more nutrients and flavor, while hot presses use heat to increase oil yield. Both methods are widely used in the food industry and for producing cooking oils.