E-books come in many different forms, depending on the choice of the e-book publishing company and the phone manufacturer. The following are some common e-book format: Ebook: This is the most common e-book format and one of the most commonly used. It supports almost all e-readers, including Android and iPhone devices. 2 PDF-format is an electronic document format commonly used to create e-books because it can accommodate a large amount of text and images. Pfft format can also be used to create e-books but requires more storage space. 3. docx: The docx format is a document format based on Word and is commonly used to create high-quality e-books. The docx format takes up more storage space than the pid format but can accommodate more text and images. 4xls: The xls format is a document format that is based on MicrosoftExcel-commonly used to create e-books. The XLS format can also be used to create high-quality e-books. 5 zip: The zip format is a compressed file format that can accommodate a large amount of text and images. Many mobile e-book readers support zipped e-books but not other forms. Mobile phones usually support a variety of e-book format, but the specific format depends on the mobile phone manufacturer and e-book reader manufacturer. Some cell phone manufacturers may limit the format supported by e-book readers, and some cell phone manufacturers may allow users to customize the format of e-books.