The design and organization of information is a key factor in creating a unified content strategy. But without a capable delivery engine, a unified content strategy is just an exercise in data collection. To turn your data into usable content, you must assemble it, format it, and deliver it to your user community, whenever and however they need it.
Delivery systems have many different capabilities. The content management system may have built-in facilities for delivering content, or you may have to integrate a delivery system with your content management system. Some delivery systems will enable you to deliver to a variety of outputs (such as web, HTML, or PDF), whereas others may be restricted to a single output.