What is a tool that lists topics in alphabetical order?

An index serves as a vital organizational tool within books, catalogs, databases, and many other informational resources. By listing subjects, terms, or topics in alphabetical order, it allows readers to locate specific information quickly and efficiently. Each entry in an index typically includes references such as page numbers or sections where the topic can be found, making it easier for the user to navigate through the material.

This feature is particularly useful for users who need to find information without having to read through the entire text, thus enhancing the accessibility of the content. An index can greatly aid in research and study by pinpointing where relevant information resides, ultimately facilitating a more effective learning or research experience.