An e-ticket (short for electronic ticket) is stored in the airline's reservation system and therefore eliminates the need for a printed airline ticket. Since all of the ticketing information is stored electronically, you will only receive an email confirmation. This confirmation, sent to the email address associated with your account, will contain the round-trip details of your flights.
When traveling, remember to bring a printout of the confirmation page (from our site) or a copy of your confirmation email. At the airport, you'll need to check in with the airline with a government issued photo ID (e.g., driver's license, passport) to receive your boarding pass. Many airlines will also allow you to check in online 24 hours prior to your departure to obtain a boarding pass. See the individual airline's website for details.