Prebiotics are a soluble dietary fibers, used to stimulate the activity, or the growth of probiotics in our digestive tract. Prebiotic fibers are not digestible for humans, or we can digest them very poorly, and the only value of dietary prebiotics is to maintain our intestinal microbiota healthy. There is some scientific debate upon the classification of prebiotics, but generally, we can call prebiotic any substance that stimulates our intestinal microflora.
This page lists various information about prebiotics such as health benefits, dietary sources, side effects, safety measures, etc...