Audience is the number of people or particular group of people who watch, read or listen to the same thing. This could be the group of people who have gathered to watch or listen to something (a play, a concert, somebody speaking…). For books, audience refers to people who read that book.
In literature, audience refers to the person for whom a writer writes, or a composer composes. We modify what we say and how we say it depending on who our audience is. Our content, tone and language changes according to what we know about our audience. In writing, audience is whom you are writing for.
In few words, audience refers to the spectators, listeners and intended readers of a writing, performance or speech.
Target audience refers to the person or group of people a piece of writing is meant for. It is whom the writer is writing to, or the person whom the author expects will read the book. The audience targeted influences the tone, theme, style, language, and the choice of characters to be used in a story. Therefore, before an author writes a story, he or she considers the age, education level and culture, expectations among other factors of that audience. A target audience could be children, the youth, adults, women or men.
Intended audience of a literary work refers to anyone who will be reached by that work. Intended audience of a book are all categories of people who will read that book. They can be of different ages, regions, culture, sex, races among others.