Digital book created by iBooks Author, a program used to create Books for macOS and iOS devices; saves the chapters, sections, and pages of the book, as well as the page layout information; also saves the book's title, introduction media, table of contents, and glossary; used for textbooks, picture books, multimedia books, and many other types of digital books.

iBook Author documents can be exported to the .IBOOKS format for direct upload to an iPad (through the iTunes software) or for sharing with others. IBA files can also be exported to .PDF or .TXT (plain text) files for reading on the local computer or other devices. IBA files are saved in a compressed .ZIP format. Therefore, you can open them manually with any Zip decompression program to see the book contents. To sell a book on the Apple Book Store, you can publish the IBA file to the .ITMSP format (iTunes Store package) by selecting File → Publish.... Next, submit the package to the Apple Book Store for review using the iTunes Producer software, which is provided for download with the iTunes Connect (iTC) Content Provider program. NOTE: Books was formerly known as "iBooks" but renamed with the release of macOS Mojave and iOS 12.