It shares USB-C connectors with USB, and can require special 'active' cables for maximum performance for cable lengths over 0.5 meters. Thunderbolt 3 is a hardware interface developed by Intel.

It was published by the USB Implementers Forum (USB-IF).

A device with a Type-C connector does not necessarily implement USB, USB Power Delivery, or any Alternate Mode. USB-C (formally known as USB Type-C) is a 24-pin USB connector system with a rotationally symmetrical connector. In a word, USB C port may not supply video out, but Thunderbolt 3 must carry video signals. Since the USB-C connectors and cables connect to both hosts and devices, replacing various electrical connectors including USB-B and USB-A, HDMI, DisplayPort, and 3.5 mm audio cables and connectors, which contains the Ethernet protocol. Now we even have Ethernet hubs, that contain 1 Ethernet port and few other functional ports like HDMI and USB 3.0, Their price is not much expensive than a single Ethernet adapter. This item can lets you connect to a network using a wired Ethernet cable on your USB C device which supports data. They all indicate a product that is male USB-C in one end and female Ethernet is on the other end. You heard one of the followings: USB Type C to Ethernet Adapter, or USB C to Ethernet adapter, or RJ45 to USB C Adapter, or LAN to USB-C Adapter, things like that.

YES, the product names can be difference. This lets you connect to a network using a wired Ethernet cable. The USB-C to Ethernet Adapter is designed to work with the computers and smart devices that have USB-C ports that supports data (most of them should be USB 3.2 or USB 3.1, some of the phone may only get USB 2.0 speed).

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