As a digital publisher, I consult to organisations how best to produce their digital publications. My preferred file format for individual, curated works is ePUB. This is an open book standard developed by the International Digital Publishing Forum. This book gives readers a sense of ePUB: What is it it? How to create an ePUB? How usable is ePUB? It provides a few case studies and identifies what we have learnt working with clients and ePUB.