A course on operating systems is an essential part of any computer science education. An operating system is a system software which manages computer hardware and interacts with users. This book deals with all the major concepts of operating systems with relevant practical explanations. The book is written for an introductory course on operating systems at the junior and senior undergraduate level or at the first year graduate level.

The fundamental concepts and algorithms covered in the book are based on those used in existing commercial operating systems. The aim is to present these concepts and algorithms in a general setting that is not tied to one particular operating system, and in the simplest and easiest terms.