What is an ARC?

ARC stands for Advance Review Copy — a copy of your finished book that you give to reviewers, bloggers, and early readers ahead of or around launch, so reviews and word-of-mouth are ready when the book goes on sale.

Because you're handing out the full book for free, you want each copy marked (so it's clearly not for resale) and ideally traceable to the reviewer who received it. That's what the ARC Watermarker does — and ARC Delivery can even email the copies out for you.