What is the difference between a zApp and a Book?

A zApp is an interactive module that may contain an introductory lesson followed by one or more questions asked in a variety of formats. zApps are self-correcting, with the exception of questions that ask for an extended response.

All of the single zApps available on the sQuizya Library are free to browse and use.

A Book is a collection of zApps, which may be divided into chapters based on theme or any method of classification and division that the author desires.