An ebook aggregator is a platform or service that collects and gathers ebooks from different publishers and makes them available in one place for readers to access and download. Full definition
There are a number of ebook aggregators like Smashwords, BookBaby, BookTango, and others that allow you to upload your ebook file and they then distribute it to a list of retailers. (sarah-holroyd.com)
Ebook aggregators distribute your book to online retailers, print book distributors send your print book to the online retailers and bookstores. (selfpubbootcamp.com)
Authors want distribution everywhere, including to libraries, and if publishers won't offer it, Smashwords will, working in partnership with library ebook aggregators such as Baker and Taylor, 3M and Overdrive, and via our own direct - acquisition service (used by DCL, Califa) called Library Direct (click my website link above to see our announcement of Library Direct). (thedigitalshift.com)