Description from the Publisher
Content is information that is organized and stored in a structured manner by eZ Publish. For example, content may be the components of a news article (such as the title, introduction, body, and images) or the properties of a car (such as the model, year, and color).
All information that is stored for the purpose of later retrieval is referred to as content. The presentation of content is determined by the design of a site.
While content refers to structured data, design refers to the way the data is visually presented. Design includes the things that make up a web interface: HTML, stylesheets (CSS), images that are not part of the content, typography, fonts, and so on.