This is the 413th most frequent Italian word.
sopra
"Above" or "on (top of)."
In this sentence, 'sopra' is used as a preposition indicating the book's position directly on the surface of the table.
Il libro è sopra il tavolo.
The book is on the table.
Here, 'sopra' indicates a direction, meaning upward or overhead.
Guarda sopra, ci sono delle stelle bellissime!
Look above, there are beautiful stars!
In this example, 'sopra' specifies a relative position, meaning higher than the door on the wall.