A flash book is basically an interactive digital book or magazine in Flash format. It’s usually created by uploading a PDF to a Flash-based converting software that mimics the page turning effect. Nowadays flash books have become obsolete because of the many vulnerabilities discovered in the Adobe Flash technology, and many browsers have blocked all flash content. Luckily, you can obtain the same effects using a superior technology: HTML5, that works perfectly with all modern browsers.
If you’re looking for a tool that helps you create HTML5 books with page flipping effects, give Flipsnack a try. It’s super easy to use. More info here.