Synopsis The word “Logic” is derived from the Greek word logos which means word, reason or discourse. It occurs as the suffix in the names of most of the sciences, such as geo-logy, bio-logy, and psycho-logy and suggests the systematic search for universal laws and principles, in accordance with sound rational criteria and experimental procedures, modified to best serve the ends of the particular science. But underlying all of the sciences, as well as the ordinary thinking of daily life, are some general logical principles common to all thought. In the broadest sense, logic is the science of evidence. It is of two types –deductive and inductive logic. The two methods are complementary both in daily life and in the sciences and it is often difficult to know where one leaves off and the other begins. The book is divided in 9 chapters describing logic in easy to understand style. I hope the book will serve the need of the students, researchers and teachers studying logic.