NVMe vs vs SATA SSD: What's the difference?

I have a SATA SSD from Samsung and a motherboard from AliExpress The specifications tell me the slot's interface is NVMe,

pfSense® Plus software must be reinstalled on the SATA drive Note The SG-2220 does not support NVMe drives The SATA slot is located underneath

m2 slot mainboard 2 drive if still takes up a SATA port? Wouldn't it be just as good to buy a full size SSD drive? Reply Taavi says

m2 expansion slot Two types of M2 SSD