This comprehensive book is aptly organized in such a way as to cover the syllabus designed under National Education Policy [NEP] for II Semester BCA Courses of Bangalore City University, Bangalore University and Bangalore North University. And also for other references. The endeavour has been to present the considerable requirements in a crisp, simple and easily assimilable way to the students. Each chapter is accompanied by a number of charts, tables and diagrams and varieties of examples which will prove to be very useful for quick revisions to the students.