An ARC, or Advanced Reader copy is a type of book format you provide for reviews BEFORE your book is published. ARCs are sometimes offered before proofreading, sometimes between proofing and the deadline of publication.
Your formatter can create arcs for you, you can use D2D, or you can use Sigil. You can also create PDFs or compile in Scrivener to create an epub. You might even be able to use Calibre. While we’ll be covering tutorials later, if you need to know in depth how to do that, it’s often worth googling it.
ARCs are solely provided to generate early reader reviews.