Local storage vs. Cookies

Question

What is the difference betwen them, and when to use local storage or cookies?

Answer 1

The main differences:

localStorage :
+ not (automatically) shared with server side
+ more space allowed to store data (still limited but newer: about mega-octets)
+ sometimes still unsupported

cookies:
+ shared with server side at each query
+ very less space allowed to store data (older: about kilo-octets)
+ widely supported

Both aren't supported in any 'webview' android context (ie: in app' html viewer), only in web browsers...

When to use depends of your needs, according to their subtil differences ;P