The gut microbiome refers to the collection of microorganisms that live in our digestive system, specifically within the gastrointestinal tract. These microorganisms include bacteria, viruses, fungi and protozoa, which play a crucial role in maintaining overall health by supporting digestion, regulating immune response, producing vitamins and preventing growth of pathogenic organisms. The gut microbiome is influenced by various factors such as diet, age, environment, and genetic predisposition, and it's essential to keep a balance in the composition of these microorganisms for optimal health.