Content Management System (CMS) - Organizing your content through a system (or tool) through the use of an administrator. content needs organization in such a manner to provide the reader (browser) with an overall "customer experience" that is easy to use, navigates with ease, & website can fulfill the role assigned to it by the business, that is, to sell to customers, or to market products and services, or to inform customers of it's intent.
So, the best way to explain it, we uncover your needs, work with you to mold it into shape and deliver a site that gives your customers what they need.