The e-book JAR format is an open source e-book format commonly used to create mobile and desktop applications. It allows applications to read e-books directly on the device and has other functions such as bookmark, annotation, and search. A JAR file is a lightweight binaries that contains the application's code, data, and run-time resources. It is usually composed of a `JAR` file name and a ` manifest` file name. The JAR's file name is usually a compressed file name such as 'zip' or 'targz', while the' manifest 'file name contains the application's meta-data information such as name, description, version number, and dependence. To generate the e-book format, you can write an application in Java to add the e-book file as a resource to the application. Then, you can package the application into a JAR file and embed it into other applications. The advantage of the e-book format was that it was easy to create and store, and could be used on different devices. The disadvantages are that it is not as popular as other format and the application's porting may be affected.