E-commerce services help businesses to sell goods and services online. They develop an E-commerce strategy for a company, and then propose a suitable E-commerce solution. Some E-commerce services specialize in helping businesses market the highest volume of goods to a targeted consumer group or demographic. Others are mass marketing specialists. Many E-commerce service providers can deliver a combination of consulting, software, and hardware solutions for E-commerce Web sites. Costs vary based on the services provided and the complexity of the work.