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In optical networking, the compact, hot-pluggable transceiver is the Small Form-factor Pluggable, or SFP. This module plugs into a dedicated SFP slot on switches, routers, or optical equipment and can be swapped while the device is powered, enabling quick upgrades or changes to the fiber link without downtime. SFPs support different fiber types and data rates, making them highly versatile for modular network designs and high-density deployments. This contrasts with Bluetooth or NFC, which are wireless technologies, and USB, which is a general-purpose wired interface not specific to fiber-network transceivers.