grammar.pronouns.possessive
Possessive pronouns: el mío, la tuya, los nuestros
Mío, tuyo, suyo, nuestro, vuestro agree with the thing possessed and usually take the article: mi casa → la mía.
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Explication
Possessive pronouns replace 'possessive + noun' and stand alone: ¿Tu coche? El mío está allá. The forms are mío, tuyo, suyo, nuestro, vuestro, suyo, each agreeing in gender and number with the thing possessed — never with the owner: la mía means 'mine' for a feminine thing even if the speaker is male.
They usually take the definite article (el mío, las tuyas), but after the verb ser the article typically drops: este libro es mío, esas llaves son nuestras. These are the 'stressed' possessives; the unstressed set (mi, tu, su) goes before the noun and is separate.
Suyo/suya is ambiguous — his, hers, yours (formal), or theirs — so for clarity Spanish often replaces it with de + pronoun: el de él, la de ella, el de usted. Context usually resolves it, but the de form removes all doubt.
Exemples
My office is small; yours is huge.
Région: global
Are these keys yours (formal)?
Région: global
Your proposal and ours are similar; theirs isn't.