A very important ingredient of Turkish cuisine.
You heard of many stories for sure! Elderly folks from middle Asia who live healthy and a long life connects all their secret to the diet which is eating yogurt pretty regularly.
Yogurt in general is a must to have almost every cuisine on a traditional turkish table. For thousands of years yogurt has been consumed as plain or as a side complemantry of Turkish cuisine.
Some examples of yogurt:
Ayran (Ai-Rahn or pronouce simply as "I-Run")
Cacik (Cucumber/Dill/Cabbage salad with yogurt)
Sauce on Mantar Kebabi
Cabbage with Yogurt
And many more...