To be "FreeSync certified", a monitor has to have certain minimum specs and must pass some tests regarding its ability to handle Variable Refresh Rate (VRR). In exchange for meeting the minimum spec and passing the tests, the monitor manufacturer gets to put the FreeSync logo on the box and include FreeSync support in its marketing. If a consumer buys an AMD graphics card and a FreeSync certified monitor then FreeSync (AMD's implementation of VRR) should work out of the box. The monitor might also be certified by Nvidia as GSync compatible, in which case another customer with an Nvidia graphics card should have the same experience with Gsync.