Here's why:
* Nouns name people, places, things, or ideas. Examples: *dog, park, book, happiness*.
* Adjectives describe nouns. They tell us more about the noun. Examples: *big, red, happy*.
* Possessive adjectives show ownership or possession. They tell us who or what something belongs to. Examples: *my, your, his, her, its, our, their*.
Example:
* My dog is brown. ("My" tells us who owns the dog.)