Dramatic Monologue-
It is a poem which consists of the feelings, experiences and views of one poetic character in relation to a particular situation. The pronoun 'I' in it does not refer to the poet.
It does not express feelings and thoughts of the poet but of some imaginary character. In this only one character speaks throughout .The past and the future are focused in the present.
some famous dramatic monologues are -
My Last Duchess and Rabbi Ben Ezra by Robert Browning
Ulysses by Alfred Lord Tennyson.