This is the 5218th most frequent Spanish word.
impreso
Printed.
In this sentence, 'impreso' functions as a past participle used as an adjective to describe the noun 'folleto', indicating that the brochure has been printed.
He leído el folleto impreso.
I have read the printed brochure.
Here, 'impreso' is a past participle used with a passive verb construction ('fue impreso') to indicate the action of printing performed on the document.
El documento fue impreso en alta calidad.
The document was printed in high quality.
In this case, 'impreso' is used as an adjective to describe 'libros', emphasizing the physical state of the books that they are printed.