Common belief about microorganisms has been built up in the mind of mass people mostly on the basis of their harmful activities. Although approximately ninety percent of all cells in the human body are microorganisms, their beneficial support on our existence has hardly ever been taken into consideration. They reside on our skin, in mouth, nose, ears, intestinal tract and genitals. The microbial material living in our gut weighs about 1-2 kg, and there are more bacteria on our skin than human beings on the Earth. Regarding these numbers, it is not surprising that the human microbiome (the entity of all microorganisms living with us) has an enormous power: Most species (out of approximately ten thousand of them) are essential for our survival, health and well-being. This article is focused to correct misbelief about microbes