This is the 4822nd most frequent Russian word.
известна
"Известна" means "famous" or "well-known" (feminine form).
In this sentence, "известна" is used as a predicate to describe who or what is known.
Её имя известно всем.
Her name is known to everyone.
Here, "известен" (masculine form) denotes fame or recognition achieved because of his artwork.
Этот художник был известен благодаря своим картинам.
This artist was famous due to his paintings.
In this example, "известна" is used to describe the book’s recognized status in its field.