Logic originally meaning "the word"or"what is spoken" is generally held to consist of the systematic study of the form of arguments. A valid argument is one where there is a specific relation of logical support between the assumptions of the argument and its conclusion.There is no universal agreement as to the exact scope and subject matter of logic, but it has traditionally included the classification of arguments, the systematic exposition of the 'logical form' common to all valid arguments, the study of inference, including fallacies, and the study of semantics, including paradoxes. Historically, logic has been studied in philosophy and mathematics and recently logic has been studied in computer science, linguistics, psychology, and other fields. The book is about the logic and talks about various aspects of it such as general character of the enquiry, argument from analogy, mathematical reasoning, etc. This book will prove to be very useful for the people interested in logic as well as the students of logic.