Exposure : Inbound, Organic Search, Social Media, Content, Community, Press, Blogosphere, Forums, Referring Links, Email, Direct, Word of Mouth, etc.
Discovery : The first few visits to the websites are often focused on consuming content and learning more about the company and product/services.
Consideration : At some point, a visitor becomes a potential customer as they consider whether the product offered is a match for their needs.
Conversion : The completion of an action on the side convert visitors to the customers.
Customer Relationship : Customer service, fulfillment, communication and happiness with the product all play info the post-conversion experience.
Retention : If customers have experiences, they often return/stay.