You can use your e-ticket at the airport to print the boarding pass without which you cannot get into the flight. Once you reach the airport, head to your airlines counter and enter your confirmation code, using the kiosk’s touch-screen system. If there is no kiosk, take the help of the agent at the counter. After asking a few flight details and making security checks, the agent will print your boarding pass. Some airlines/airports also allow you to use a smartphone app as your boarding pass.