In theatre, a monologue is a speech presented by a single character, most often to express their thoughts aloud, though sometimes also to directly address another character or the audience. Monologues are common across the range of dramatic media, 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.

A solo performance, sometimes referred to as a one-man show, one-woman show, or one-person show, features a single person telling a story for an audience, typically for the purpose of entertainment. This type of performance comes in many varieties, including autobiographical creations, comedy acts, novel adaptations, vaudeville, poetry, music and dance. In 1996, Rob Becker's Defending the Caveman became the longest-running one-person play in the history of Broadway theatre.