What is a share label?

When I create a share link, an unlabeled field shows up above “Allow editing”, “Hide download”, etc. Here’s a screenshot:

Looking at the HTML source for the input element I see “Share label”… so what’s a share label? What is its purpose?

If you use multiple (most public) shares you can give them a name to manage them. I use the field also to store the password because after setting the password i can not read it anymore :wink:
If you only use one share or shares for e-mail or users it makes less sense.