In Word and HTML documents, you can use styles to apply paragraph formats (such as indentation and spacing) to give your documents a uniform appearance.
Doc-To-Help extends the concept of styles to include Help authoring behavior. For any paragraph style that has special help-authoring behavior, a like-named paragraph style must exist in the Doc-To-Help project file. Doc-To-Help comes with many predefined paragraph styles, so it is not usually necessary to create your own. You have the option, if necessary, but this is an advanced feature. By customizing the properties of Doc-To-Help styles, you define the behavior of the compiled Help system.
For more information, see Using Paragraph Styles.