Audience

Demographics: The age, gender, education level, and other characteristics of the readers who are likely to be interested in the book. Interests: The topics, themes, or genres that the book covers, and the types of readers who are interested in those topics.

Reading level: The complexity and style of the writing, and the reading level required to understand the book. Market research:

Surveys or other research that provide insight into preferences and habits of potential readers. By understanding the characteristics and preferences of the target audience, both authors and publishers can tailor their marketing strategies and book content to better appeal to that group.

This can include choosing a right cover design and promotional messaging that speaks directly to the intended audience. Knowing your audience is more far-reaching than one might realize and can certainly help sell books.