Can You Help me Understand This SATA NVMe PCIe SSD Gen

Can You Help me Understand This SATA NVMe PCIe SSD Gen m 2 slot vs pcie The expansion card lets you take full advantage of the fast performance and compact size of PCIe internal solid-state drives With the PCIe based drives m2 sata vs nvme slot The drives just slot into the slot on the motherboard and are connected via NVMe to the CPU Image Photo of SSD drive

m2 sata vs nvme slot Verilux NVIDIA NVME Adapter PCIe x16 with Gel Pad, NVME or AHCI SSD to PCIE Adapter Card for Key M 2230, 2242, 2260, 2280 Size SSD, Support PCIe x4

m24 slot 2 replaces the Mini SATA standard and the Mini PCIe standard Employing a more flexible physical specification, allows different module 2 based SSDs are the NVMe based models that connect via PCI-express SSDs are essentially high-speed memory similar to RAM, but