Google Cast is a technology that allows users to stream content from their devices, like smartphones or tablets, to a larger screen, such as a TV. It works by connecting to compatible devices, enabling users to enjoy videos, music, and games on a bigger display without needing complicated setups. To use Google Cast, you simply select the content you want to watch and tap the cast icon on your device. This sends the media to a Chromecast or other compatible device connected to your TV. It supports various apps, making it easy to access popular services like YouTube and Netflix.