A website builds credibility. Nothing is more important than the ability to be found. If you don't have an established online identity, then customers can't find you. Not showing up in the search engines (or on the Internet at all for that matter) is one of the fastest ways to lose credibility as a business.
E-commerce (electronic commerce or EC) is the buying and selling of goods and services, or the transmitting of funds or data, over an electronic network, primarily the internet. These business transactions occur either as business-to-business, business-to-consumer, consumer-to-consumer or consumer-to-business.