It is easy to confuse output types with targets, but they are two different (although related) concepts. A target is one instance of an output type. It is the engine that takes all of your files and settings, and brings them together to produce the end result. When you build your final output, you are essentially building one or more of the targets in your project.
When you create a new Doc-To-Help project, one target of each output type is added to your project.
However, any targets added to the project are just a starting point for you. You can rename them to reflect the nature of your project. For example, if you are writing a Help system for a software program called FictionSoftPro, you could rename a target "FictionSoftPro." Also, just because only one target was added when you first created the project, this does not mean that you are limited to just that target in your project. You can add as many new targets as you need, using any of the available formats. Each target has properties that you adjust to change the way the target behaves, as well as the way it looks and feels.