Recycled cooking oil is used cooking oil that has been processed to remove impurities and contaminants. This oil can come from various sources, such as restaurants or households, where it is collected after frying foods. Once cleaned, it can be repurposed for various applications, including biodiesel production and animal feed. The recycling process typically involves filtering and refining the oil to ensure it meets safety and quality standards. By recycling cooking oil, we can reduce waste and promote sustainability, as it helps to conserve natural resources and decrease environmental pollution associated with disposal methods like landfilling.