Please consult the following Turkish ministerial website for all information for foreign visitors to Turkey and any visa requirements applicable to your citizenship.
As of April 17, 2013, electronic visa (e-Visa) replaces “sticker visa” which was issued at the border crossings. Applicants just need to log on to www.evisa.gov.tr , provide the requested information, (after the application is approved) make online payment and download their e-Visa.
Passports should be valid at least six months longer than the expiry date of the requested visa.
Please note that e-visa is only valid when the purpose of travel is tourism or commerce.