A biogas digester is a system that breaks down organic materials, such as food waste and animal manure, in an oxygen-free environment. This process, known as anaerobic digestion, produces biogas, which is primarily composed of methane and carbon dioxide. The biogas can be used as a renewable energy source for cooking, heating, or generating electricity. In addition to producing energy, biogas digesters help reduce waste and lower greenhouse gas emissions. The leftover material, called digestate, can be used as a nutrient-rich fertilizer for crops. This makes biogas digesters an effective solution for sustainable waste management and energy production.