Yes - an Auto Login Token is a short line of code inserted at the end of a hyperlink which creates a unique personal login to an interactive (registration) site, app, or portal.
When an attendee (or presenter, exhibitor etc) clicks on this personalized link, it will open their specific and unique view of the site, app or portal and log them in immediately.
For their convenience, the contact details you have on file will also pre-populate (already be filled in). Search this help site for more information.