The Follow Project widget allows participants, registered or unregistered, to 'follow' any published project, effectively becoming a subscriber for the project newsletters. It is a simple field that asks for an email address only. The list of subscribers is then collated and made available to use when sending newsletters. You can read more about how to use this widget in your project in the detailed article on Encourage participants to follow your project.
The sign up banner widget will direct a non-registered user to the site registration form, to fill in all the registration details. This banner will NOT show if the user is already registered on the site. You can read more about how to use this widget in your project in the detailed article on Activate the signup banner.