Here's why:
* Conjunctions connect words, phrases, or clauses. They include words like "and", "but", "or", "because", "so", etc.
* Interrogative adverbs introduce questions. They include words like "why", "how", "when", "where", and "what".
Example:
* Conjunction: "I went to the store and bought some milk." (The conjunction "and" connects the two actions.)
* Interrogative adverb: "Why did you go to the store?" (The interrogative adverb "why" asks for the reason for going to the store.)