A Kindle is an e-book reader produced by Amazon. Each time Amazon brings out a newer generation Kindle, they change the device and add new features. It is important to know what generation you have, in order to buy compatible accessories. For example, a Kindle 2 cover will not fit on a Kindle 1. Every generation allows book downloads directly from Amazon, but they differ in how the user can get online.
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Look at the back of your Kindle. If you find an SD card slot, you have a Kindle 1.
Measure the display size. Most Kindles have a 6-inch screen. If you have a 9.7-inch screen, you have a DX.
Inspect the keyboard. If the toggle is built into the keyboard, you have a 3rd generation. If it is higher, close to the Next Page button, you have a 2nd generation.