Encyclopaedia of e-Commerce is devised to provide teachers, students and laymen interested in e-commerce with clear, concise, and correct definitions and descriptions of the e-commerce terms. The explanations of entries range from brief definitions of a new lines to expository discussions of various lengths. The aim of this encyclopaedia is to satisfy the immediate technology needs of the user. E-Commerce is presented as unified, ever-growing, and stimulating body of knowledge. In terms of its broader objuectives, the present book may bve viewed as an outline or compendium of e-commerce ideas correlated with a large collections of specialized items.