Ebooks are the virtual incarnations of literary works which can be read on ebook readers, tablets, and smartphones, in a manner analogous to reading a physically printed book.  With the appropriate software, ebooks can also be read on desktop computers.

Ebooks must be expressed and packaged in the specific file format appropriate to the device on which the literary work will be read.

There is much commonality, in that many devices can display files adhering to the EPUB standard. However, some devices require that ebooks be packaged using different file formats. LaBeag produces ebooks in a variety of formats.