This is the 271st most frequent Polish word.
jaki
"What" or "which" (used to ask about the type, kind, or condition).
Here, 'jaki' is an interrogative pronoun used to ask about the quality or type of an object, in this case, the color.
Jaki kolor lubisz najbardziej?
What color do you like the most?
In this sentence, 'jaki' functions in an indirect question to specify the subject (the result of the match).
Nie wiem, jaki będzie wynik meczu.
I don't know what the match's result will be.
In this context, 'jaki' is used as a relative pronoun, describing the preceding noun (car) and introducing a subordinate clause.