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The term "fuel" broadly refers to any material that can be consumed to produce energy. This includes traditional fossil fuels like petroleum, coal, and natural gas, which are derived from ancient organic matter and are non-renewable.1

In contrast, biofuels are derived from recently living organisms, such as plants or animal waste, making them a renewable energy source. Examples include ethanol, produced from crops like corn or sugarcane, and biodiesel, made from vegetable oils.2

Another category is fuel cells, which convert chemical energy directly into electricity through electrochemical reactions, often using hydrogen as a fuel.3

Technological advancements have focused on improving fuel efficiency and developing new fuel types. For instance, petroleum refining processes like thermal and catalytic cracking were developed to increase the yield of lighter, more valuable fuels like gasoline from heavier crude oil fractions. The development of cellulosic ethanol represents a move towards using non-food biomass for biofuel production, aiming to mitigate the "food versus fuel" debate.45

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