This is a basic, introductory book on public international law. The purpose of this book is to elucidate the subject to the readers who are novices to the field of public international law. The exposition is replete with illustrations and case-law in order to make the subject interesting and also to help readers understand the conceptually difficult topics. The book is student friendly, The language is lucid and all the chapters have been presented in a structured manned which would help students prepare for their examinations..