This poem is one of Browning's great dramatic monologue. The dramatic monologue is a specific type of poem in which the speaker reveals to an implied audience some relevant piece of information. In doing so, the diction and style the speaker uses eventually reflects more about his or her own mental or moral character than is initially intended. As others have mentioned, this is a form of direct characterization, such that the reader must piece together the true from the false.
This speaker has committed a horrific crime by strangling his beloved so that he can keep her with him forever without change in the relationship. The poetic lines move quickly and smoothly along, masking the morbid events described.
Some readers note...
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