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The iPad Pro is a line of tablet computers designed, developed, and marketed by Apple Inc., that runs the iOS mobile operating system. It is currently available in two screen sizes, 10.5-inch and 12.9-inch, each with three options for internal storage capacities: 64, 256 or 512 GB; the 512 GB configuration making the iPad Pro the first iOS device to offer that storage size.
The first iPad Pro, the 12.9-inch version, was announced on September 9, 2015, and released on November 11. It is larger than all previous iPad models and the first iPad tablet to feature LPDDR4 RAM. The 12.9-inch tablet was later followed, by the smaller 9.7-inch version, which was announced on March 21, 2016, and released on March 31.
At WWDC 2017 on June 5, 2017, an updated generation of iPad Pro was announced. This updated generation features A10X Fusion processors, a base storage capacity of 64 GB and highest of 512 GB, an upgraded display and a new 10.5-inch version to replace the 9.7-inch model; the 12.9-inch version was refreshed and both screen sizes were released on June 13. Following this announcement, the first generation iPad Pro was removed from the Apple Store.
Source: Wikipedia