E-Commerce (electronic commerce) refers to the purchasing and selling of goods and services, as well as the transmission of payments and data, over an electronic network, most commonly the internet. Business-to-business (B2B), business-to-consumer (B2C), consumer-to-consumer, and consumer-to-business transactions are all possible. E-commerce and e-business are concepts that are frequently used interchangeably. The term e-tail is also used to describe the transactional operations that go into online retail shopping.In this book Content covers all the transaction techniques- like how Internet was first establish & how it is maintained without & what different services are provided with it & who ¿s responsibilities are assigned to work .Three chapter contain the intra-net information & its services and four chapter covers the billing details how the scanners works, what are scanner code works, what is barcode¿ etc.