www.office.com/myaccount - Network Interface Card (NIC) also known as a network adapter is the component of a computer's hardware that serves as the connection between a computer and an internet connection. It can be used on either a wireless (Ethernet) as well as wireless (WIFI) network. No matter which type of network card that you are using it's essential to verify the speed of your network card. In this article we'll explain how to test the network cards (Ethernet or WIFI) speeds on Windows 10.