This is the 4918th most frequent Russian word.
книга
"Книга" means "book" in English.
The word 'книга' here, used in plural form 'книги', signifies ownership and location of the books.
Мои книги лежат на столе.
My books are lying on the table.
The word 'книга' is used here to denote a physical book as an object of reading.
Я читаю новую книгу.
I am reading a new book.
Here, 'книга' refers to the book as an item being discussed for its characteristics.