This is the 1918th most frequent Polish word.
ty
"You" (singular, informal).
The word 'ty' is used as a subject pronoun to directly refer to the person being addressed.
Ty jesteś moim najlepszym przyjacielem.
You are my best friend.
The word 'ty' emphasizes the subject of the sentence and the person being asked the question.
Czy ty mnie słyszysz?
Can you hear me?
The word 'ty' emphasizes the inclusive subject, questioning if the addressed person shares the same interest.