Here's why:
* Conjunctions connect words, phrases, or clauses.
* Nouns name people, places, things, or ideas.
* Adjectives describe nouns.
Examples:
* Conjunction: "I like apples, but I don't like oranges." (connects the two clauses)
* Noun: "The cat sat on the mat." (cat is the noun)
* Adjective: "The red car is fast." (red describes the noun 'car')