EPUB (short for electronic publication; alternatively capitalized as ePub, EPub, or epub, with "EPUB" preferred by the vendor) is afree and open e-book standard by the International Digital Publishing Forum (IDPF). Files have the extension .epub. EPUB is designed for reflowable content, meaning that the text display can be optimized for the particular display device. [from wikipedia]
A software and hardware platform developed by Amazon.com for the rendering and displaying of e-books and other digital media. Three hardware devices, known as "Kindle," "Kindle 2," and "Kindle DX" support this platform. Kindle software applications exist for Windows, iPhone OS, BlackBerry and Mac OS X. Amazon's first hardware device, the Kindle First Generation, was released in the United States on November 19, 2007. [from wikipedia]
The print editions are shipped to your door with beautiful full-color cover artwork, perfect-bound, and printed at 6x9".