what's means of instagram tokens

I use wp theme ( newspaper )I read " instagram account expires in 56 days" in the theme panel , Instagram account access configuration ,
Someone could help me what it is meaning ?

It’s a string which identifies and connects an IG account to an app or website.

In your case it will be used to validate the Instagram profile that you are pulling content through from to display on your website

These tokens are not permanent and do expire so you may end up having to generate a new one from time to time