Explanation:

a. E-business (i.e., electronic business) is derived from the terms “e-mail” and “ecommerce”. It refers to the trading of goods and services through computer systems and online networks. There is no exchange of cash or money across the counter and the payment is made online with the help of payment gateways. 

b. B to C stands for business to consumer. It refers to commercial transactions between business firms and consumers. In this type of e-business transaction, firms give information about their products on their websites along with information about the delivery services they provide. 

c. The expanded form of ATM is automated teller machine. ATM is an electronic machine that offers convenience to customers, as they can deposit or withdraw money from their accounts anytime, without having the need to visit the branch of the bank. 

d. A payment gateway is an e-commerce application service provider. Retailers, manufacturers, dealers and sellers of goods can make payments online in a secure manner with the help of this application. 

e. HTTP stands for Hyper Text Transfer Protocol. It is a standard protocol between the client and the server which is approved by the Internet Engineering Task Force. The primary function of this protocol is to provide security in transmitting confidential information and messages.