An imprint is a trade name, or brand name, used by a publisher to identify a line of books or a publishing arm within the organization. You may have multiple imprints. The imprints may be developed to market works to different buyer interests. Unlike a “division” an imprint does not represent an entity with a corporate life of its own. Essentially for ISBN identification, Publisher Name = Imprint Name.
Note for Amazon customers: Your Amazon Imprint Name should be the same name as your Publisher or Company Name to your ISBNs.