'e'

No, we are not talking about drugs here! ‘E’ is shorthand for ‘electronic’ and is the classic sign of a product being transformed into an electronic version of an existing product.
Examples include: ‘E-comerce’, ‘E-tickets’, ‘E-diary’, ‘E-books’. They are electronic versions of some other more familiar product. When a revolutionary product is created, it makes sense in the beginning to market it as being ‘like something else’. For example, an ‘E-book’ is like a book, except it is electronic. By using familar terms, we are able to make new things more easily understood.
Examples: e-books, e-commerce, e-mail, e-ticket