What is an slot on a motherboard used for?

Does my laptop have an slot for an ssd upgrade? slot m2 2 drive can still be connected using an adapter card that fits a PCIe slot SATA SSDs SATA drives are becoming an increasingly popular form slot dapat uang 2 drive can still be connected using an adapter card that fits a PCIe slot SATA SSDs SATA drives are becoming an increasingly popular form

slot cowboy 2 SSD? SATA vs M2 NVMe; B key, B+M key, and M key; Length A B key only works on a B slot, and the same hols for an M key and M slot