NVMe is not just the M.2 SSD you put on your mainboard. NVMe is a whole ecosystem around the idea of implementing fast access to solid state drives, not only locally, but also remotely.
Learn all about NVMe that you should know, but never cared to ask. Simplyblock just published its newest blog post, explaining the NVMe technology, its use cases, and the reason why it was created in the first place to replace SCSI and SAS.