With storage events you can store data on your local machine. This is similar to cookies but with storage events you can store more data than cookies. There are two types of storage events:
Local storage exists forever, or at least as long as the browser is installed and working. Session storage only holds the value for the lifetime of the session. A session holds the values of the items in an application for the time that a user is logged in in the application.
One important remark is that web storage can have different values for different browsers. Keep that in mind when working with web storage and multiple browsers.
Local storage can be used in APEX applications for user or machine specific ...