What is BISAC?
BISAC is an acronym for Book Industry Standards and Communications.
The BISAC Subject Heading list is an industry-approved list of subject descriptors, each of which is represented by a nine-character alphanumeric code. The descriptor itself consists of two, three or four levels in the manner described below
The BISAC Subject Heading list was developed to standardize the electronic transfer of subject information. The headings can be used for transmitting information between trading partners, as search terms in bibliographic databases, as access points for database searching and as shelving guides. Many businesses require that publishers use BISAC Subject Headings when submitting data for all formats (physical and digital).
Many businesses within the North American book industry, including Amazon, Baker & Taylor, Barnes & Noble, Bookscan, Bowker, Indiebound, Indigo, Ingram and most major publishers use the headings in a variety of ways. Some libraries are also utilizing the BISAC Subjects to facilitate the browsing experience for patrons.
Compiled from https://bisg.org/page/BISACEdition