Packages contain everything your guest receives when they are registered for your event. Packages contain the number of seats / places / registrations you are offering each guest. For paid tickets, they also contain the price of the ticket and a description of what the buyer receives. For 3rd Party sponsors / partners, they might contain a table or a number of seats at your event, a description of all the benefits your sponsor receives and instructions for their guest coordinator.
The most simple Packages are the default Invite and Register Packages. The default Invite contains one ‘seat / registration’ at your event. When a guest clicks ‘Accept’ on an invite containing this Package, they are registered for the event. The default Register packages contains one ‘seat / registration’ at your event. When someone registers at your Register page using that Package, they are registered for the event.