It's the combination of two words:
* "de" - meaning "of" or "from"
* "los" - meaning "the" (masculine plural)
It's used in various contexts, for example:
* "Los colores de los árboles" - The colors of the trees
* "El libro de los muertos" - The Book of the Dead
* "El sonido de los pájaros" - The sound of the birds
* "Las calles de la ciudad" - The streets of the city
It's important to note that "de los" is only used for masculine plural nouns. For feminine plural nouns, you would use "de las".