This is the 52nd most frequent Greek word.
αυτά
The Greek word "αυτά" means "they" or "them" (neutral plural).
'Αυτά' is used here as a demonstrative pronoun referring to the books.
Αυτά τα βιβλία είναι καινούρια.
These books are new.
'Αυτά' is used as a demonstrative pronoun referring to unspecified items assumed to be known by the context.
Μπορείς να μου δώσεις αυτά;
Can you pass me these?
'Αυτά' refers to events or things from the past, employed as a pronoun.