This is the 2754th most frequent Russian word.
какая
"Какая" means "which" or "what" (feminine singular).
The word 'какая' is used in an exclamatory manner to express admiration for the beauty of the painting.
Какая красивая картина!
What a beautiful painting!
Here, 'какая' is used to question the identity or type of book in someone's possession.
Какая у тебя книга?
What book do you have?
In this instance, 'какая' serves to form a relative clause specifying the particular road being referred to.