Ticketing:- This is best suited for Entertainment, sports or events of similar nature. Where the nomenclature is used such as Buy Ticket, Issue Ticket, Ticket Details etc.
Registration:- This nomenclature is best suited for Business events, Conferences, workshops seminars etc. In this type, the buttons or the wording changes to Register, Issue Pass, close Registration and so on.
RSVP:- This is a type of event where you just want to count the confirmation of attendees who are committed to attending your event. This is mostly a free event where no payment is needed to be paid by the attendees.