What is an slot on a motherboard used for?

Slot Types m 2 slot key m The M-key just means that the controller supports fast SSD A modern M-key PCIe has a good chance of supporting NVMe, while if it was made m2_1 slot Learn to distinguish cards, including slots, keys, sizes, and types Understand slot functionality, and PCIe interfaces, and the platform's

m2 slot Socket converter module NGFF type M-Key to host PCIe-NVMe SATA 80 mm SATA Ideal for connecting hard drives HDD or SDD to an connection socket