I want to network two of my computers and was told I need a Wireless network interface card.

Here's the Amazon description:
Up to 600Mbps Wi-Fi speed (2.4GHz/150Mbps+5GHz/433Mbps) . Excellent performance to reduce freezing and lags when streaming and gaming
Upgrade your PC,laptop or Mac to work with the latest AC WiFi router for faster speed. No freezing and lags when video streaming and gaming.
Activate the SoftAP function to create a WiFi hotspot for mobile devices when there is only wired internet connection
Support WPS One Button Setup, Just Need to Press WPS Button, Help You Install and Activate a Secure Wireless Network in a Minute.
Compatible with windows 10/8.1/8/7/XP/Vista,Mac OSX,Linux.