Biological fertilizers, also known as biofertilizers, are natural substances that enhance soil fertility and plant growth. They contain living microorganisms, such as bacteria, fungi, and algae, which help improve nutrient availability and promote healthy root development. These fertilizers can be derived from various sources, including compost, manure, and plant residues. Using biological fertilizers can lead to sustainable agriculture by reducing the need for chemical fertilizers. They improve soil structure, increase microbial activity, and enhance nutrient cycling. This approach supports environmental health and can lead to better crop yields while minimizing negative impacts on ecosystems.