Most European and North/South American nationals (Schengen/UK/US/etc) and many Eastern Asian nationals (e.g. China (PRC), South Korea, Thailand, Japan) are except from VISA requirements to enter Türkiye.
Nationals requiring an e-VISA (non-exhaustive list): Australia, Cyprus (ROC), Mexico, South Africa, Taiwan (ROC), Vietnam, etc.
Nationals requiring a consular VISA (non-exhaustive list): Egypt, India, Pakistan, etc.
Please refer to the website of the ministry of foreign affairs for official information.