What is the difference between demonstrative adjectives and pronoun?

The demonstrative pronouns are this, that, these, and those.

A demonstrative pronoun is a Word that takes the place of a noun indicating near or far in place or time.

An adjective is a Word that is placed before a noun to describe the noun.

Examples:

This is mother's favorite music. (demonstrative pronoun)
This music is mother's favorite. (adjective)