To understand what it means, we need more information. For example:
* Where did you encounter this phrase? Was it on a website, in an advertisement, or in a conversation?
* What was the context? What was being discussed or advertised?
Possible Interpretations:
Here are some possibilities based on common uses of the phrase "a la carte":
* Individual book purchases: It could refer to the option of buying individual books, as opposed to a subscription service or bundled package.
* Customizable book bundles: It might describe a service where you can create your own book bundles by choosing specific titles from a selection.
* Individual chapters or sections: It could be used for a system where you purchase specific chapters or sections of a book, instead of the whole book.
* Digital book offerings: It might refer to a system where you can purchase individual chapters, sections, or pages of a digital book, as opposed to the entire book.
To give you a more accurate answer, please provide more details about the situation where you encountered this phrase.