Electronic commerce, commonly known as ecommerce or e-Commerce, consists of the buying and selling of products or services over electronic systems such as the Internet and other computer networks. The amount of trade conducted electronically has grown extraordinarily since the spread of the Internet. Defining a site the first step of developing an e-commerce site is defining a site. That mean you have to define site name and vision, mission and product type and others. You select your product catalog is sports, electronics, gift item, DVDs CDs, toys etc.