This is the 5737th most frequent Russian word.
продано
"Sold."
In this sentence, 'продана' describes a state resulting from the completed action of selling the book.
Эта книга продана на аукционе.
This book was sold at the auction.
'Продана' indicates the passive form of the perfective aspect, showing the action of selling was completed.
Квартира была продана вчера.
The apartment was sold yesterday.
'Продано' is used here as part of a notice to indicate that an item or items are sold out.