What are the various ways of acquiring library materials?

Library materials can be acquired through several methods, including purchasing from publishers or vendors, licensing digital resources, exchanging materials with other libraries (interlibrary loans), and receiving donations from individuals or organizations. Additionally, libraries may participate in consortia to share resources and negotiate better pricing. Some libraries also utilize grants or funding from institutions to expand their collections. Lastly, cataloging and archiving materials from their own special collections is another way libraries enhance their offerings.