Probiotics are live microorganisms—usually bacteria or yeast. “Pro” means for and “biotic” means life, so, literally for life. Probiotics are microscopic and not so visible friend of ours, present in delicious dairy, cereal or pulses-based fermented foods. For all that an army is to a country, probiotics are to the gut. Believe it or not, they actually protect the human gut against harmful invaders who, if given a chance, may attack our system.