If it was released in the 90s it would be considered a super computer. Yet it costs just over £50 and is powered by the 15 watts 12v usb cable that can be connected to a TV.
It is a system on a chip (soc). This means they made a micro processor that does everything, it processes video, data and sound. They made an all encompassing microprocessor that does all the work of an entire desktop computer.
At also has Bluetooth so you can connect an input device to it like a Bluetooth keyboard & Mouse.
The Chromecast itself can fit inside the palm of your hand.