An e-ticket is an electronic ticket, which we send to you by email, or by post in some instances, as confirmation of your booking. You can access your booking details at any time on ba.com or at an airport check-in kiosk. All you need is your booking reference, which is a series of six letters and numbers that uniquely identify your booking, and the passenger's last name.
e-ticket is now the airline industry standard with paper tickets being phased out completely in the near future by all airlines.
The benefits to you are:
*There are some exceptions in certain countries ie. where payment must be made in person.