At a glance you can see: Main Ebook Formats Major Ebook Stores Ebook Royalties Chart for Each Store Ebook Aggregator Comparison Chart Ebook Revenue Growth Chart eReaders & -LSB-...] (publishyourownebooks.com)
Google also allows users to upload ePubs and PDFs to their ebook libraries, but all the other main ebook stores like Kobo, Barnes and Noble, and Apple don't offer any such feature. (blog.the-ebook-reader.com)
We provide you with your eBook file in the two main eBook file formats (MOBI and ePUB) that are accepted by eBook distributors, such as Amazon Kindle Direct Publishing (KDP) and IngramSpark. (self-pub.net)