To visit Turkey, travellers must have visa. For some countries there is need visa while for some there is no need.
Citizens of 80 countries must take visa from Turkish Diplomatic Missions before their travel to Turkey.
Some countries which Turkey requires visa may have e-visa. E-visa can only be used for the visit of tourism and business.
To have more information about e-visa you may visit www.evisa.gov.tr
Please do not forget printing and getting your e-visa before your travel.