Speaker- is the person talking in the poem and about the poem also who is telling the story. Also changes the tome and shows different emotions.

Example-  "What soft, cherubic creatures
                 These gentlewomen are!
                 One would as soon assault a plush
                 Or violate a star."

Significance of the term- The speaker can change the tone of the poem by the tone of voice they choose to           

                                         use and the emotion that they express when reading the poem.

                                                                 Picture-