Thanks for reaching out to OkadaBooks. Tags are several words that describe your book. E.g, if I’m publishing a children's book, my tags will be something like Children, children’s book, the story of Ada (If I am uploading a romance book, I’ll use tags like Romance, fiction, adult, a story of reckless love, Okon Ifeanyi). You can add whatever number of tags you want. Author name can also be a tag and each tag is separated by a comma. You can use tags to search for a book on the app and on the website.