"घोड़ा तुम्हारा है"
अनुवाद:The horse is yours
Your is an possessive pronoun and yours is a possessive adjective which means yours describe the specialty of object to which it's associated.
'The horse is yours.' means the specialty of horse is that it is your. 'It is your horse.' means that the horse belongs to you.
Both things eventually mean the same, just 'your' works like an pronoun and 'yours' work like an adjective.