Electronic commerce, EC, e-commerce or 
ecommerce consists primarily of the distributing, 
buying, selling, marketing, and servicing 
of products or services over electronic systems 
such as the Internet and other computer networks 
which connect to verify DATA Base. 

Suppliers offering services to 
E.C. electronic commerce practitioners

Financial::
iBill 
Moneybookers 
PayPal 
WebMoney 
Yahoo

Software::
ECommerce Shopping Cart 
ECommerce Solution 
ATG 
eMeta Corporation 
Ingenta 
NetSuite Inc. 
osCommerce 
Actinic E-Commerce 
Zen Cart 
Cubecart 

Shop-Script::
Amazon.com 
eBay 
exostar 
Goldbar 
MercadoLibre.com 
Mercantila.com 
Newegg.com 
Nuvvo 
Overstock.com 
rediff.com 
Smarthome 
Uship 
.......
Bricks and clicks business model 
Business-to-business electronic commerce 
Business-to-consumer electronic commerce 
Credit card fraud 
Disintermediation 
ETrading 
Electronic business 
E-marketing 
Internet fraud 
Management 
Marketing 
Online auction business model 
PaySafe 
Product feeds 
Reintermediation 
Secure electronic transaction - a credit card security protocol 
Web traffic 

Entities using electronic commerce

more reference::
http://en.wikipedia.org/wiki/Electronic_commerce