php – I use a public device vs keep me connected

I know this might be an obvious question, but it escapes me. When connecting to websites, I saw checkboxes for things like "I'm using a public device" and "Keep me connected."

I know that keeping me connected would be the traditional login function that would aim to keep the user always connected. But I am stuck on the function "I'm using a public device", what does it actually do? Does this simply limit the duration of the login period?

I do not use session IDs, I use a token cookie with a 24-hour expiration that is associated in a database table to the user and subsequently to his cart .