You will recognize M.2 SSD: why some M.2 SSD have two notches?
Citystores M.2 NGFF NVMe Key A/E to Key M SSD Adapter Plate Converter with LED Indicator - Walmart.com
M.2 Interface, Key and Socket explained
SATA 3 vs M.2 vs NVMe – Overview and Comparison
M.2 Interface, Key and Socket explained
Amazon.com: Dual M.2 SSD NVME (m Key) or SATA (b Key) to PCI-e 3.0 x 4 Host Controller Expansion Card with Low Profile Bracket and Heatsink for Desktop (Gold) : Electronics