To store information locally while we are offline—or even online but we don’t want to use AJAX— HTML5-related technologies offer us three options:

In this book we are going to use the Web Storage API because it’s the simplest one and the most compatible API between A-grade jQuery Mobile browsers. This is a very simple API supporting two key-value based collections: localStorage and sessionStorage.

localStorage is a collection of strings stored persistently on the device and sessionStorage is pretty similar but it is removed from the system when the browser is closed.