E-tickets are electronic tickets, stored in the airline’s computer system instead of being physically printed. With e-tickets, you no longer have to worry about losing your ticket and you no longer have a document that you have to carry around with you when traveling.
When flying on an E-ticket, the airline will print you a boarding pass at check-in time. Depending on the specific airline it may be possible to print your boarding pass online within 24 hours of your departure by visiting their website.
It is a good idea to bring a printed confirmation like the one we will e-mail you, for quick access to your flight information, but even that is not required. A government issued photo ID is required for check-in.