What is an SFP Port?

Can anyone share it with me? The hardware configuration is as follows: Shelf type: 6500 14-Slot Packet-Optical

The 1-Port Gigabit Ethernet SFP Mini-PIM is installed in the second slot of the device chassis; the output shows the FPC status for slot 2 as online Verifying

slot position JetStream 24-Port SFP L2+ Managed Switch with 4 10GE SFP+ Slots As a 10G switch that seamlessly integrates into the Omada Software Defined Networking

slot koi 1Gbps TP 8-Ports + 110G SFP 4-Slots SFC8100-BP_2x2 10G L2 Industrial 1Gbps TP 8-Ports + 110G SFP 4-Slots + BYPASS 2x2 SFC8100-BP_4x4