"Audience" and "public" are used interchangeably. Both terms refer to the target group at which an item of communication is directed.
The group most likely to be interested in the subject matter of the book.
a highly structured group, with a fairly definite educational or recreational purpose
Population or target group viewing a television programme or an advertising campaign
A group of individuals or companies to be targeted by a promotion or advertisement. In other words, itâ€(tm)s who you want to talk to.
Individual, group or institution for which the organization's products and services are provided, e.g., library patrons, museum visitors, other libraries, museums or partner institutions.