What is the purpose of RJ45 ports on laptops?

Solved: Double RJ45 port on access point rj45 slot RJ45 port to 10GBase-X SFPSFP+ slot un-managed fiber media converter The SFP+ port can work with any 10G rated SFP+ such as SR, LR, ER, ZR, BiDi, CWDM or magic spinners slot Push the RJ45 connector into the slot of your crimping tool for RJ45 connectors The slot should be labeled something like “8P” for the 8-pin RJ45 connector

situs slot jitu RJ45 slot and conducts through copper how is that different from a standard EthernetRJ45 connection? What really differentiates SFP from