Originally, according to William and Mary Morris' Dictionary of Word and Phrase Origins, it was an architectural term referring to an outbuilding not incorporated into the architect's main design. It was adopted by the culinary elite to describe dishes served apart from the main course.
For marketers, content marketing is an appetizer, an hors d'oeuvre, meant to attract the attention of the customer. It must be fresh, rich, attractive and tasty...but not filling. The customer must remain hungry for the next big bite.
Keep a fresh supply quality content on your table -- attract more qualified, interested clients.
This infographic is a grand display of how content works for you.