* Frequency Adverb: When "again" indicates repetition, it's a frequency adverb. For example: "I went to the store again."
* Adverb of Time: "Again" can also indicate a point in time, making it an adverb of time. For example: "I'll try again tomorrow."
* Adverb of Manner: In some cases, "again" can modify a verb, describing how the action is performed. For example: "He played the song again."
Ultimately, the specific type of adverb "again" functions as depends on its context within a sentence.