TechyInAZ :
FreeSync fixes an issue that started when lcd monitors came into existence. You either had lag (with v sync on) or tearing (no v sync),
Actually, the only thing that changed when LCDs came along is that they had a fixed framerate that was lower than most CRTs could reach. LCDs could also worsen lag with additional buffering, since the signal is digital, but I don't know how common that is/was.
TechyInAZ :
FreeSync addresses this issue by making the frame rate of the GPU the same refresh rate as the monitor. So if the GPU was rendering at only 47fps, the monitor will only refresh 47 times per second. Making games buttery smooth.
The way you said it is backwards. It forces the monitor to match the GPU's framerate. The way it works is that the GPU only sends a frame when the image has changed, rather than being forced to send frames at a specific, fixed framerate. This reduces lag & jitter because the GPU can display a new frame as soon as it's ready, instead of having to wait until the next refresh period. It also allows you to hit higher than 60 FPS, but there's no guarantee that the monitor will display a frame if it arrives too soon after the previous one. Finally, it eliminates tearing because the monitor will only display a new frame in its entirety.