Bacteria are prokaryotic microorganisms which are generally a few micrometers in length. The biological branch which deals with the studies related to the morphology, genetics, ecology and biochemistry of bacteria is referred to as bacteriology. It is a sub-field of microbiology that is particularly concerned with the identification, classification and characterization of bacterial species. Bacteriology is applied in the development of vaccines for various diseases such as diphtheria and tetanus. There are numerous areas where principles of bacteriology are applied and studied such as agriculture, marine biology and biotechnology. This book is compiled in such a manner, that it will provide in-depth knowledge about the theory and practice of bacteriology. The topics included herein on this topic are of utmost significance and bound to provide incredible insights to readers. This book aims to serve as a resource guide for students and experts alike and contribute to the growth of the discipline.