Chromecast is a dongle which is sold by Google and used for streaming from your PC to a screen in which the Chromecast is connected to (using HDMI port).
The Chromecast actually shows on the screen what you see on your Chrome browser on your PC (you should install a plugin extension for Chromecast on your Chrome browser to make the PC/browser talk with the Chromecast) or on your Android device and not everything that runs on your desktop. So, for instance, if you like to watch a video on the screen, the video should run not on your desktop, but inside your Chrome browser. Besides that, the Chromecast can broadcast materials from web apps or mobile apps which support the Chromecast technology, so it’s not only the browser.
The first generation was launched on 2013 (for 35 USD each, in the U.S.A.). Now, in 2015, we have the second generation of the Chromecast which is much improved than the first generation.
The second generation is actually 2 types: one specializes in audio streaming, while the other is an enhanced type. The Chromecast Audio adds advanced WiFi abilities to any speaker or audio system. So, if you have some useless speakers at home, then adding the Chromecast Audio to them will bring them back to business.
The second generation has less problems with buffering, that’s why it is much better than the first generation. The design is totally different and when connecting it to a TV where there is a little space between the TV and the wall behind, it is positioned much better than the old Chromecast.
The Chromecast is not a solution for digital signage. It is more for home entertainment and can also be used for presentations (casting the lecturer’s PC or Android smartphone to a screen) or special events on big screens. However, some use the Chromecast as a menu board. We don’t find it as a natural for this.