Here's why:
* Adverbs modify verbs, adjectives, or other adverbs. They describe how, when, where, or to what extent something happens.
* Conjunctions connect words, phrases, or clauses.
In a sentence, "often" will typically tell you how frequently something occurs.
Example:
* Often I go for walks in the park. ("Often" modifies the verb "go" and tells us how frequently the action happens.)
Let me know if you have any more questions!