Answer: heading
Step-by-step explanation:
It is best to use the heading styles to get a table of contents to build easily. In this case, when the table of contents us inserted, a section will be created for each heading.
When one applies the heading style, one is simply telling Ms Word that a new section in the document is about to begin. The heading style when used for the chapters can be used to know the number of sections that are contained in a document.