Answer:
A speech given by an actor to an audience, such as the Stage Manager's speech in the first act of Our Town, is called a monologue.
Explanation:
Monologue is a type of text that is interpreted or uttered by only one person. In this way, the speech is made for itself, so that the audience, readers or listeners have the feeling of reading the thoughts of their interpreter.
A play can be a monologue, but it can also be just part of a scenario in which other characters are present or not.