A network card makes your PC or laptop network-compatible. It can therefore communicate with other devices in a network or access the Internet. As a rule, network cards are already installed on the mainboard and no additional components in the form of a network card are needed to make your computer network-compatible. However, if you want to increase your transmission speeds, for example, you can upgrade your system with a separate network card with more performance.
In addition to the classic network cards with Ethernet connections, there are also WLAN cards that give you the option of connecting devices or your router wirelessly.