Oil is collected from deep underground using large drills and pumps. It is found in places that were once underwater, where dead plants and animals were buried under layers of mud and sand over millions of years. Once extracted, oil is sent to refineries where it is cleaned and separated into useful parts like gasoline, diesel, and kerosene. However, oil is a finite resource that will eventually run out. It also harms the environment by contributing to issues like global warming, air pollution, and acid rain when burned as fuel. More sustainable energy sources could help reduce our dependence on oil.