‘Again’ is primarily classified as an adverb. It is used to indicate that something is happening once more or is being repeated. For instance, in the sentence ‘I will try again,’ the word ‘again’ modifies the verb ‘try,’ telling us that this action is being attempted another time.
Adverbs often provide information about how, when, where, or to what extent an action occurs, and ‘again’ falls into this category by signaling a repetition. While the primary function of ‘again’ is as an adverb, context can slightly modify its usage or perception, but its core role remains the same.