In Portuguese possessive adjectives indicate ownership in the same way “my”, “your”, “his”, “her”, and “our” do in English.

Like most adjectives in Portuguese they also change form for the gender and plurality of the object they modify. For example, with a masculine noun “my dog” is meu cão but “my dogs” is meus cães. In the case of a feminine noun, “my cow” is minha vaca and “my cows” is minhas vacas.

Seu in all its forms is equivalent to “his”, “her” and “their” in English and also “your” if you’re speaking to some formally or using the você form of address. While “his” and “her” in English change based on the gender of the possessor, in Portuguese the words change based on the gender of the object being possessed.

Vosso and its forms are equivalent to “your” when you’re addressing a group of people but is mostly only used in Portugal.