E-world, a series of ten books, is a humble effort to provide comprehensive learning and understanding of basic concepts and applications of computers using internet. The books have been written keeping in mind the feedback received during more than a decade of experience in teaching and interacting with the students and the practical knowledge gained during professional services. Interspersed with illustrations, tips and interesting facts, the concepts have been presented in a lucid and student-friendly manner useful for students, teachers, researchers, academicians and professionals. This series contains following ten volumes: E-Banking and E-Commerce, E-Business and E-Marketing, E-Export, E-Sales, E-Governance, E-Security, E-Learning, E-Education, E-Know ledge, E-Libraries.