Oil depletion refers to the gradual reduction of available crude oil resources as they are extracted and consumed. This process occurs because oil is a finite resource, meaning there is a limited amount of it beneath the Earth's surface. As more oil is used for energy, transportation, and manufacturing, the remaining reserves become harder to access and extract. The consequences of oil depletion can include rising energy costs, increased competition for remaining resources, and potential economic instability. Additionally, it may drive the search for alternative energy sources, such as solar energy or wind power, to reduce reliance on fossil fuels and promote sustainability.