Do Google accounts overlap?

Question

Google

Good afternoon!
On Google services from above there is an opportunity to "add an account". Q: Do these accounts overlap? Is there access from one account to another?

Answer 1

The "add account" button is made in order to quickly switch between different accounts on the site, for example, between personal and work, corporate. It gives only that it is not necessary to log out and log in again every time you switch, but simply click the "Go to another account" button. Akki do not communicate with each other in any way.