No visa is issued to Indian citizens at the airport. If you have a Schengen visa or valid visa or residence from one of the Schengen countries or a valid US, UK or Ireland visa, then you can use that as a supporting document to evisa that you can get, online, from: www.evisa.gov.tr
If you do not have such a supporting document, then you have to apply for a regular Turkish visa at a Turkish Embassy/Consulate.
No visa is issued to Indian citizens at the airport. If you have a Schengen visa or valid visa or residence from one of the Schengen countries or a valid US, UK or Ireland visa, then you can use that as a supporting document to evisa that you can get, online, from: www.evisa.gov.tr
If you do not have such a supporting document, then you have to apply for a regular Turkish visa at a Turkish Embassy/Consulate.