Every Typefi publication is made up of one or more Typefi Sections. A Typefi Section is a division within a publication that breaks it into logical chunks, such as chapters in a book.
The first Typefi component that you must insert in a Word document is a Typefi Section (see Insert a Typefi Section). This is also why you’re prompted to insert a Section when creating a new Typefi document.
In Typefi Designer, Sections specify which Adobe InDesign parent pages (formerly master pages) to use during the composition process, and in what order; for more information, see Typefi Sections in Typefi Designer.