Microbes are tiny organisms—too tiny to see without a microscope, yet they are abundant on Earth. They live everywhere—in air, soil, rock, and water. We couldn’t digest food without them—animals couldn’t, either. Principle purpose of this lecture is to present on Microbes, its characteristics and variances. Without microbes, plants couldn’t grow, garbage wouldn’t decay and there would be a lot less oxygen to breathe. Some microbes cause disease but the majority are completely harmless.