Content is the information provided on the site. It is not just text, but music, sound, animation, or video -- anything that communicates a sites body of knowledge. Good content should be engaging, relevant, and appropriate for the audience. You can tell it s been developed for the Web because it s clear and concise and it works in the medium. Good content takes a stand. It has a voice, a point of view. It may be informative, useful, or funny but it always leaves you wanting more.
Structure and navigation refers to the framework of a site, the organization of content, the prioritization of information, and the method in which you move through the site. Sites with good structure and navigation are consistent, intuitive and transparent. They allow you to form a mental model of the information provided, where to find things, and what to expect when you click. Good navigation gets you where you want to go quickly and offers easy access to the breadth and depth of the site s content.