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"Algunos" is a form of "algunos", an adjective which is often translated as "some". "Unos libros" is a phrase which is often translated as "a few books". Learn more about the difference between "unos libros" and "algunos" below.
unos libros
A phrase is a group of words commonly used together (e.g., once upon a time).
1. (general)
a. a few books
Necesito sacar unos libros de la biblioteca para escribir mi ensayo sobre novelas de fantasía.I need to borrow a few books from the library to write my essay on fantasy novels.
b. some books
Tengo unos libros que podrían interesarte, Julia. Son sobre la Edad Media.I have some books that might interest you, Julia. They're about the Middle Ages.
algunos(
ahl
-
goo
-
nohs
)An adjective is a word that describes a noun (e.g., the big dog).
A pronoun is a word that stands in for a noun (e.g., she).
c. some people (plural)
A word or phrase that is plural (e.g., los libros).
Algunos simplemente no aprecian lo bonita que es la naturaleza en esta área.Some people just don't appreciate appreciate how beautiful nature is in this area.