Browser storage lets a website keep small pieces of information in your browser. It is like a drawer in your own home where a site can leave a note for your next visit.
A website may remember a selected theme or temporarily keep work in a form. Some storage lasts only for a visit; some can remain until it is cleared.
This information is stored on your device, not automatically shared with every site. Do not treat browser storage as a safe place for secrets, and remember that clearing site data may remove saved preferences.