What is the difference between an SSD and an NVMe M

What is the difference between an SSD and an NVMe M nvme slot vs m 2 2 or the NVMe drives are also SSD drives, but with a different interface, faster speed, and are built to be used as internal storage NVMe nvme vs m2 slot NVME drive uses pci-e signal, while SATA still uses SATA signal They are quite different Most ssd enclosures only support either one

nvme vs m2 slot 2 SSDs: SATA and NVMe SATA uses an older interface with one designed around hard drives while NVMe is designed for flash memory

nvme pcie 40 in 30 slot 2 drives are “keyed” at one end so as to prevent the end-user from inserting them in an incompatible socket PCIe NVMe drives are 'M' keyed SATA ones, SSD slots, just that they are nvme OLED vs Traditional LED display Like charcoal vs propane or gas vs diesel, OLED vs LED