You may want to connect an Arduino MKR board with an Ethernet cable instead of using WiFi. An Ethernet connection can sometimes be stabler, faster, and more secure. To do this, plug in the Arduino MKR ETH shield.
Are you developing a project for an environment where wireless connections are unavailable or would be inefficient? The MKR ETH shield allows to have a wired Ethernet connection between your MKR board and your network or the Internet. This is particularly useful for devices located where either electromagnetic noise is a problem or there are special safety requirements.