Possessive determiners show who owns something.
Examples of possessive determiners are my, his, her, your, our, their, etc. In a sentence, a possessive determiner comes before a noun or a pronoun to show who or what owns it.
E.g. Those are my trainers. 👟
E.g. Her name is Jenny. 🙎🏻♀️
Demonstrative determiners show which person or thing is being referred to.
Examples of demonstrative determiners are this, that, these, and those. In a sentence, a demonstrative pronoun is commonly followed by a verb.
E.g. This is my book. 📕
E.g. Those are my shoes. 👞
Click here to learn about demonstratives.