The branch of biology which is involved in the study of unicellular, multicellular and acellular microorganisms is known as microbiology. These microorganisms are broadly divided into prokaryotic and eukaryotic microorganisms. Microbiology encompasses various sub-fields which are classified as either pure microbiology or applied microbiology. Pure microbiology includes fields such as virology, parasitology, bacteriology and mycology. Applied microbiology includes fields like medical microbiology, pharmaceutical microbiology, food microbiology and agricultural microbiology. There are widespread applications of this field such as industrial fermentation, production of amino acids and the production of biopolymers. The topics included in this textbook on microbiology are of utmost significance and bound to provide incredible insights to readers. Some of the diverse topics covered in this textbook address the varied branches that fall under this category. It will serve as a valuable source of reference for those interested in this field.