native contain ersistent local storage
the operating system typically provides an abstraction layer for storing and retrieving application-specific data like preferences or runtime state. These values may be stored in the registry, INI files, XML files,
about web application
in early invent the cookies to web app
can be used for persistent local storage of small amounts of data. But they have three potentially dealbreaking downsides:
1-slowing down your application because cookies included to each HTTP request .
2- sending data unencrypted over the internet (unless your entire web application is served over SSL).
3-Cookies are limited to about 4 KB of data — enough to slow down your application (see above), but not enough to be terribly useful.
userData allows web pages to store up to 64 KB of data per domain, in a hierarchical XML-based structure.
Local Shared Objects: Local Shared Objects.
an open source browser plugin aimed at providing additional capabilities in browsers
way for web pages to store named key/value pairs locally, within the client web browser. Like cookies, this data persists even after you navigate away from the web site,
1-his data persists even after you navigate away from the web site,
2- close your browser tab.
3- this data is never transmitted to the remote web server .