Here's why:
* Prepositions show the relationship between a noun or pronoun and another word in the sentence. They often describe location, time, or direction.
* Conjunctions connect words, phrases, or clauses. They include words like "and", "but", "or", and "because".
Examples:
* Preposition: "I read a book about history." (About shows the relationship between "book" and "history")
* Conjunction: "I like to read and I like to write." (And connects the two verbs)
Let me know if you'd like more examples or explanations!