Why is dramatic monologue used consistently in Victorian poetry? explain its purpose

A dramatic monologue is a form of poem that appeared during the Victorian era. It is a one person's speech which puts special emphasis on subjective qualities that are left to the audience to interpret.

Victorian poets used this monologues to give the speaker a space in which he can express himself by addressing an implied or actual listener. Usually, the speaker reveals more than he intends to, thus giving the reader an opportunity to complete the meaning of what he is saying.