This is the 353rd most frequent Japanese word.
どれ
"Which one?"
Used to inquire about a specific item among multiple options.
どれがあなたの本ですか？
Which one is your book?
Used to express inclusivity, implying all the choices are considered.
どれも美味しそうですね。
They all look tasty, don't they?
Used within a context to specify a choice within a subset.