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Kindle is a portable, wireless e-reader that allows users to browse, download and read e-books, magazines, blogs, newspapers and other digital media. Kindle mimics reading on paper, by using electronic paper and E Ink to display up to 16-level grayscale. Kindle was developed in November 2007 by Lab126, Inc., a small subsidiary of Amazon.com.
In 2009, the Kindle app was released for PC and Macintosh computers, iPhone and iPod Touch. The app allows users to read Kindle e-books on other devices without additional costs. In 2010, the Kindle app was released for the iPad and other tablet computers, such as the Samsung Galaxy Tab.
Depending on the version, Kindle's features include:
The first Kindle was exclusively released to the U.S. market in late 2007. Priced at $399, it sold out within hours of release and remained out of stock until April 2008. The original is the only Kindle with an expandable secure digital (SD) card slot. It also features a 6-inch diagonal screen, 250 MB of memory and a four-level grayscale. The first version's internal memory could hold approximately 200 non-illustrated titles that may be downloaded for purchase from Amazon.
Kindle was first released with more than 88,000 digital e-books for download. As of 2011, more than 125,000 titles are available.
In August, 2010, the Kindle 3 was announced, boasting free and built-in 3 GBps connectivity and Wi-Fi, higher contrast than earlier versions, faster refresh rates, a smaller size and higher internal memory than previous versions.