Nowadays, most travellers are accustomed to web check-in. Web check-in is a breakthrough that benefits all passengers as airlines work to simplify processes and ease travel. The majority of airline websites have a "Web Check In" or "Check In" tab on their home page. Web check-in allows you to choose your seats and print boarding passes while sitting at home. Your boarding pass's bar code contains the reservation details. You can proceed directly to the security checkpoint area once you arrive at the airport, then proceed to the gate and board the airplane.
If you simply have carry-on luggage, you can go straight to the security check but you have to go to your airline's counter if you have luggage that needs to be checked. Most airlines will offer a separate baggage drop area for travellers who checked in online.