Importing Cookies into Browser

What is the idea behind importing cookies into a browser? How does it get done in parctice?

snapsafe said:

How does it get done in parctice?

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All browsers let you pass in a list of command-line arguments to load specific session data. So you can save cookies from a session to a user profile, and then load the browser with this user profile to continue the same session.
This way different user-profiles act as different isolated environments with different cookies and auth tokens etc

In practice people use an antidetect browsers for this which have nice GUIs for doing this stuff.