Learning to use a CAD system is compulsory for engineers and designers. It is necessary to begin with the basic alphabets of AutoCAD and learn how to use it correctly and effectively through continuous practice. CAD systems create designs using basic geometric entities and many constructions used in technical designs. Universities, engineering colleges, polytechnics and ITIs of our country have also modified their syllabi according to industry needs and have introduced 'AutoCAD' as an important sessional subject. As per AICTE guided syllabus for diploma level of engineering, AutoCAD 2D and 3D have been introduced in the subject 'Professional Practice-I' in 3rd semester and 'Professional Practice-II' in 4th semester in most of the branches (mechanical, civil, automobile, architecture, electrical, etc.).This book will be invaluable for the students of Professional Practice-I.