Answer
Cookies and localStorage both save browser data, but they behave differently. • Cookies are small and may be sent with web requests. • localStorage stays in the browser and holds more data. • Choose the option whose defined semantics and behavior match the task.
💡 Simple Example
<p>Use a secure cookie for a login session and localStorage for a theme choice.</p>
⚡ Quick Revision
Cookies can travel to the server; localStorage stays in the browser.