What is Chromecast? Chromecast is a small Wi-Fi transmitter/receiver that allows you to view certain content when connecting to a display that has an HDMI input it can also be connected to the VGA or AV input with our converters.Ĭhromecast uses Wi-Fi and the signals are not encrypted - the Chromecast transmitter does not have a default encryption, such as WEP, so it should be relatively easy to hack into - a hacker should be able to 'grab' the information that you transmit.