how chromecast works Chromecast does the opposite of what streaming media devices do. Streaming media devices are a gateway between your TV and the internet, but Chromecast does things differently by showing whatever is playing on your tablet, laptop or smartphone screen on your big screen TV. You first configure the device using your laptop through Chromecasts USB feature,  so it can actually connect the Chromecast device to the PC or laptop itself so it can be programmed with Wifi settings.  After this you plug it into TV so that the Chrome browser can communicate with it through the Wifi network connection in your house.  If your wifi is fast enough, then video will play just fine.  Chrome doesn’t use the same video that’s playing on your laptop or phone as the source, but it get’s the video directly itself from whatever website or source online so you don’t experience any resolutions issues. Chromecast, which plugs into an HD television’s HDMI port and requires a Wi-Fi connection, allows you to pick out a YouTube video on a smartphone and press a “cast button” to play it on the TV. As the video plays on the big screen, you can pause it, adjust the volume, or switch to another video within the same mobile YouTube app. Others in the room can control the same television with their own devices, too. The TV is actually getting the content from Chromecast’s own Wi-Fi source, not the mobile device (which handily solves the problem of how to scale a cellphone-sized video onto a 50-inch screen).