What is an ebook?
a book composed in or converted to digital format for display on a computer screen or handheld device. Merriam Webster https://www.merriam-webster.com/dictionary/e-book
An eBook is an electronic version of a traditional print book that can be read by using a personal computer or by using an eBook reader. https://searchmobilecomputing.techtarget.com/definition/eBook