This book contains a variety of special features that will make the studying a better experience. Our experience in the classroom has taught us that students are facing problem in searching the subject matter as per their syllabus. They have to sit in library or surf internet for long hours in search of a single topic which seems to be uneconomical both in terms of energy and time. For conserving the precious time of students, which they can devote in learning and practicing rather than searching, we have written this book strictly according to the INC guidelines. The subject matter is presented under 7 chapters. Each chapter has the key terms preceding the unit. At the end of each chapter review questions are provided. This brings to the notice of the students the aspects they need to focus and it too acts as an evaluation tool for them. There are questions which are purely of information recall type; there are questions which need analytical thinking to answer and hence test true understanding.