What are demonstrative adjectives ?
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Here is an explanation of both which would make the difference between both of them clear:
Possessive Adjectives: The adjective which modifies the noun by attributing possession or characteristic feature to it is called a possessive adjective. This adjective shows who owns or possesses something. Instances of the same are: - my, your, his, her, its, our, their.
Demonstrative Adjectives: A demonstrative adjective is used to specify a particular instance or set of instances of a noun. The four demonstrative adjectives in the English language are this, that, these and those, and are placed before the noun being demonstrated.