This is the 37th most frequent Ukrainian word.
яка
"Яка" in English means "which" or "what kind of."
Here, 'яка' is used as an exclamation to express admiration, translating to 'what a' in English.
Яка гарна сонячна погода сьогодні!
What a wonderful sunny weather today!
Here, 'яка' is used as an interrogative pronoun to ask a question, translating to 'what' in English.
Яка це буде сума грошей?
What will this amount of money be?
In this context, 'яка' is a relative pronoun introducing a clause that describes the book, translating to 'that' in English.