speech presented by a single character
In theatre, a monologue (from Greek: μονόλογος, from μόνος mónos, "alone, solitary" and λόγος lógos, "speech") is a speech presented by a single character, most often to express their mental thoughts aloud, though sometimes also to directly address another character or the audience. Monologues are common across the range of dramatic media (plays, films, etc.), as well as in non-dramatic media such as poetry. Monologues share much in common with several other literary devices including soliloquies, apostrophes, and asides. There are, however, distinctions between each of these devices.
Read more or edit on Wikipedia