The phrase "target readers" refers to a specific group of people that a book or content is intended for. It means the people that the writer or author is trying to reach and communicate with through their work. Full definition
You need to establish your presence in communities of target readers for your work. (toughnickel.com)
I'd rather build my list first, fill them with targeted readers who actively read books in my genre, then offer them my giveaway without making it public. (creativindie.com)
So while he gets to maintain a hobby, he's also promoting his book and connecting with target readers. (thecreativepenn.com)