The document discusses access points in library catalogs, which are units of information like author, title, subject, or classification number that users can search under to find and identify library items. It explains that main entries were traditionally the primary access point but now with electronic catalogs, almost any part of a catalog record can serve as an access point. The document also provides examples of access points like uniform titles, personal names, geographical headings, and the different access points available in the Follett Destiny catalog system.