SFP (Small Form-factor Pluggable) is a compact, hot-pluggable network interface module used to connect network devices (switches, routers, firewalls) to fiber optic or copper cables. An SFP interface on networking hardware is a modular slot for a media-specific transceiver, such as for a fiber-optic cable or a copper. A fiber optic connector is a mechanical device used to align and join optical fibers, enabling light to pass through with minimal loss. As a network engineer, you will work with. Small form-factor pluggable (SFP) transceivers are a core technology in many networks, providing communication between switches and important network components.