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"Aquellos" is a form of "aquellos", an adjective which is often translated as "those". "Los que" is a phrase which is often translated as "the ones that". Learn more about the difference between "aquellos" and "los que" below.
aquellos()
An adjective is a word that describes a noun (e.g., the big dog).
a. those
Nací en 1920 y, en aquellos días, no teníamos televisión.I was born in 1920, and in those days, we didn't have television.
Aquellas montañas a lo lejos son las más altas del país.Those mountains in the distance are the tallest in the country.
A pronoun is a word that stands in for a noun (e.g., she).
a. those
¿Te acuerdas de los sánduches que hacían aquí antes? - Sí, aquellos eran muy buenos.Do you remember the sandwiches they used to make here? - Yeah, those were really good.
Vi unas camisas parecidas a estas hace un tiempo, pero me gustaron más aquellas.I saw some shirts like these ones a while ago, but I liked those more.
b. those ones
No quiero estos melocotones. Quiero aquellos.I don't want these peaches. I want those ones.
Estas sillas son baratas, pero aquellas son más bonitas.These chairs are cheap, but those ones are nicer.
los que
A phrase is a group of words commonly used together (e.g., once upon a time).
a. the ones that
¿Ves esos trofeos? Son los que gané el año pasado.Do you see those trophies over there? Those are the ones that I won last year.
b. the ones who (people)
Mario y Armando son los que organizaron la fiesta.Mario and Armando are the ones who organized the party.
