EGO is a card which you need for a metro or buses in Ankara.
To get an EGO card, you can go into the Metro stations or look for an EGO advertisement outside convenience stores. The EGO card works for buses and the metro. Remember to show a student card if you can, or merely say “ogrenci” so that your fare is only 1.10TL instead of 1.85TL. You can also buy EGO cards at small stands on the street that sell cigarettes and snacks, they will have a sign advertising it.
If you use the bus or metro with your EGO card, you have 45 minutes to change to a new bus or metro without having to pay again. You will still have to put your card in, but it will not charge you a second time.