Probiotics are live microorganisms that provide a health benefit to the host when given in sufficient concentrations. Probiotic microorganisms are divided into several categories. Prebiotics were originally defined as a nondigestible dietary supplement that has a favourable effect on the host by encouraging the growth or activity of a small number of bacteria in the colon. The microbiota and the nutrients that feed these organisms, such as dietary fibre, probiotics, and prebiotics, make up gut microecology. The microecology is constantly changing and active. Microbiota management methods such as probiotics and prebiotics are used to improve host health. They target the gut to treat gastrointestinal disorders.