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DualShock is a series of PlayStation analog controllers. The most notable feature of the controllers is the inclusion of a vibration function.
The first DualShock was released in 1997 for the original PlayStation as the successor to the Dual Analog controller. The DualShock 2 followed shortly after, with the launch of the PlayStation 2 in 2000.
At launch, the PlayStation 3 controller, the Sixaxis, did not feature vibration, focusing instead on motion sensitivity. However, a version was later released including both functions, named the DualShock 3.
With the launch of the PlayStation 4 in 2013, the DualShock was again bundled. This incarnation, DualShock 4, was heavily redesigned. The first time since the controller launched in 1997. Some of the main changes to the design were the shape and feel of the controller, and the addition of a touchpad and "Share" button.