Answer:
Publicity
Explanation:
Publicity is a marketing strategy that can be defined or said to be creation of awareness or conveying of information about a good and/or service to the public through various media means to attract the public or target audience.
IN the case of this question, using the reviews of other people that have read the new book helps the public or target audience have an insight into the books contents and as such helps to give them an awareness and brief understanding of or insight into the book.
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