Your ticket (e-ticket) is forwarded to you by e-mail usually as an attached PDF-file.
You will not receive a paper ticket but only an E-ticket and/or a reservation number. Your reservation number is used for online, kiosk or desk check-in, to obtain a valid boarding pass. Please remember to ALWAYS collect a boarding pass. Some airlines offer to send the boarding pass directly to Your smartphone. This may either be scanned at a kiosk for boarding pass printing or used directly as a boarding pass ( Airline and Airport dependant).
Some airlines, primarily low cost carriers, have mandatory online check in, and significant penalties if you neglect to do so.