Which document component is often used in lengthy texts to ease access to topics?

The component that is most effective for easing access to topics in lengthy texts is the Table of Contents. This section provides an organized listing of the document's chapters, sections, and sometimes even subsections along with their corresponding page numbers. This structure allows readers to quickly locate the information they need without having to skim through all the content.

A well-constructed Table of Contents enhances the navigability of the document, especially in complex texts where information is spread across many pages. It is particularly useful for readers who may not be familiar with the material or who need to reference specific sections efficiently.

While an appendix, report supplement, or glossary serve important functions in elaborating on additional information, providing supplementary context, or defining terms, none of these components serve the primary purpose of guiding readers to specific sections of the text as effectively as a Table of Contents does.