Simply put, the LC classification system groups together library materials on similar subjects by call numbers.There are 21 main LC call number classifications or classes.
The "power of browsing":
Libraries use classification systems to organize their materials on the shelves. A classification system uses letters and/or numbers (call numbers) to arrange the materials on the same topic are together. This arrangement results in "serendipitous browsing:" identify one book in the catalog, go to the shelf, and, an even better book is sitting right next to it.
Remember: the Call Number is the address of the book (or video, etc.)
Open link in new tab/window to further explore the topics under each main subject: