E-commerce :

E-commerce implies electronic commerce i.e., business or shopping is transacted through electronic means such as Internet. In e-commerce it is essential that the business transaction take place over the Internet. However the payment deliveries may either take place electrically or through physical/conventional means. E-commerce, ties together several different technologies including banking, programming and web designing etc.

Payment gateway :

Payment gateway is an interface that links the internet shopper, the web merchant and banking system in a secure environment.

• It authenticates parties involved in the transaction. Gate way routes messages securely between the parties of authorization and settlement of the transaction.
• It ensures integrity and privacy of all messages.
• It provides administration support to the parties involved.

Payment gateway allows the customers to make secure payment using credit cards. The merchant gets hassle-free account maintenance. The following are the companies which provides Payment Gateways in india.

ICICI
Global Telesystems
HDFC Bank
Citibank
Easy Netcom Pvt. Ltd.