Acer Travelmate P2 TMP214-53, slot type

What is an slot on a motherboard used for? m 2 2280 slot 2 2230 SSD with a 2280 SSD, the SSD screw mount must be shifted to fit the m2_1 slot Industrial Motherboards & Slot SBC · Intelligent Transportation Systems KioxiaSSSTC SEMI-WT SSD 128GB 2280 SATA TLC -25~+85 KIOXIA BiCS5; SATA 6

m2 sata vs nvme slot 2 slot ? Im NOT talking about expansion cards to pcie slots