Short for Media Access Control, by the way. Every network device or interface has a unique ID, known as the MAC address, which can be useful for when setting up internet access for that device.
On Windows 10, the MAC address your network card is what you will want to find out, and there are two quick ways to do that.
The first one is the quickest, and involves the Command Prompt, while it is also possible to find your MAC address in the Network Connection Settings panel.
For the former, simply open the Command Prompt by right-clicking the Start button and selecting Command Prompt from the menu.
Here, type in ipconfig / all and press the Enter key to display your network configuration. Scroll down to your network adapter and then look for the value that is shown next to Physical Address, which is essentially your MAC address.
Another way to find your MAC address is by looking at the details of your network adapter in Windows.
Search for View Network Connections in the taskbar, or navigate to Control Panel > Network and Internet > Network Connections to bring up your connection panel.
Right-click your network connection and select Status, and then click the Details button.
Here, again, locate the Physical Address in the Network Connection Details window.