In which scenario would cookies be least useful?

Cookies are small pieces of data stored on a user's computer by the web browser while browsing a website. They serve various purposes, but one key limitation is their size. Cookies typically have a maximum size limit of around 4KB per cookie.

In the scenario of storing large amounts of data, cookies would be least useful because their size restriction severely limits the volume of information they can hold. Attempting to use cookies for storing large datasets would lead to inadequate storage capacity, which could compromise functionality or even result in failure to store necessary data.

On the other hand, tracking user sessions, remembering user preferences, and keeping users logged in across sessions all involve managing relatively small amounts of information, which is well within the limits of what cookies can handle effectively, making these scenarios appropriate uses for cookies.