is there difference between possesive pronoun and possesive adjective

A possessive pronoun is used to express possession. It is the pronoun itself which explains the sense of possession.

For instance,

1. The book which I read was his;

2. It was her phone number;

3. Our school bus leaves in 5 minutes.

However, a possessive adjective helps to attribute the same sense of possession or belongingness to a noun. A noun is bound to follow a possessive adjective.

For instance,

1. She took her music classes very seriously;

2. They left his place at 5pm;

3. Whose do you think these footprints belong to?