The Chromecast allows you to wirelessly send a tab from your Chrome browser to a TV or projector. Think of it as a Google equivalent of Apple's Airplay.
First step is to add the Chromecast extension to your browser. You can download this right here
. Once that's done, simply plug in your Chromecast (one end into your projector's HDMI port, the other into a USB port to power it), click on the Chromecast icon
and select your Chromecast (ours are named 6th Grade, 7th Grade, and 8th Grade). At this point, everything in your tab will be displayed through the projector. Check out the video below for further instructions.