What is an sfp slot on a switch?

rj 45 - RJ45 -SFP Connection? slot sfp FIS's metal housing 2-Port Gigabit Switch with 2 SFP Slots, model F1-SFP0202G, provides performance, proven reliability, and flexible extension of your slot ovo 24-TP ports + 2-SFP slot Gigabit Switch *Internal Power supply *Rack mountable *Support ONOFF button

slot machine books My questio is, can SFP+ slots support both SFP and SFP+ modules and should operate at the same time, in switch like WS-C3850-48P-L or WS-C3850-24P-L ? we