I am a bit confused by my Android TV:

 
 
 - There is an app called Mirroring. When I start it, it asks me to use a thing called Miracast.
 
 - On my phone (Huawei) there is an app called MirrorShare. It was the only mirroring-related app, so I decided to try it.
 
 - After starting it, with my surprise, my TV got displayed as a compatible device. I connected to it and it seemed to work: my phone's screen (with **A LOT** of delay) got mirrored on my TV.
 
 - In the TV settings there is also an entry called "Google Cast". So why is it now Google Cast and not "Miracast" or whatever it's called?
 
 - I searched for Google Cast on Play Store and I found the official app by Google.
 
 - I installed it. Even this time, the TV got detected, but when I tried connecting, I noticed the delay of the screen was **A LOT LESS**, for example, Asphalt 8 was pretty playable.
 
 - I searched on the Internet for all these terms, and another word I saw everywhere was "Chromecast".

What is the difference between these technologies? Are some of these different ways to call the same thing? Wasn't Chromecast that little item you stick behind your non-smart TV to see Netflix or YouTube on it?