The pronoun cujo/cuja means ‘whose’ and precedes a noun without an article, but is employed as an adjective pronoun.
Ex : Qual será o animal cujo nome a autora não quis escrever?
Ex. Which would be the animal whose name the author did not wish to write?
[whose name = the name of which]
Ex: Gosto muito desse compositor cujas músicas sei de cor.
Ex. I really like that composer whose songs I know by heart.
[whose songs=songs of who]
As one can observe, cujo/cuja has a possessive value that agrees in gender and number with the object possessed. Keep in mind that it isn’t used in everyday speech but it may be found in literature.