Fossil fuels are natural resources formed from the remains of ancient plants and animals buried under layers of earth for millions of years. The main types of fossil fuels include coal, oil, and natural gas. These fuels are primarily used for energy production, heating, and powering vehicles. When burned, fossil fuels release energy, but they also emit greenhouse gases like carbon dioxide, contributing to climate change. As a result, there is a growing interest in alternative energy sources, such as solar and wind energy, to reduce reliance on fossil fuels and minimize environmental impact.