Proteins are large biomolecules or macromolecules, which perform various functions within organisms such as DNA replication, catalyzing metabolic reactions, transport of molecules and response to stimuli. The scientific study of proteins is under the domain of proteomics. It encompasses the study of protein composition, structure and activity patterns. Some of the fundamental experimental techniques used in proteomics are 2D electrophoresis, protein microarrays, mass spectrometry and two-hybrid screening. This book is compiled in such a manner, that it will provide in-depth knowledge about the theory and practice of proteomics. The aim of this book is to present researches that have transformed this discipline and aided its advancement. It will prove to be immensely beneficial to students and researchers in this field.