Why State Of Origin popular game in Australia?

Today will be held on State of Origin 2020 game 3 in Australia. If you know why the state of origin game popular in Australia please comment bellow. I don't know why the game is very popular game rugby.

I just include some URL here they provide a live stream of the state of origin game 3 live streaming.

https://www.game.tv/tournaments/LIVE-NSW-vs-QLD-Live'Stream-game3-state-of-origin-2020--b739e5a1630a436c92ff3995b0627d55
https://www.game.tv/tournaments/State-of-Origin-2020-Live-Reddit-Queensland-Maroons-vs-NSW-Blues-Live-Stream-FREE--cc2651f4051149968cc097c12fbb91c7

https://www.game.tv/tournaments/Fox-State-of-Origin-2020-Game-3-live-stream-updates--ff1051c23bbb4e2a9603a5c55d125c51
https://www.game.tv/tournaments/9Now-State-of-Origin-2020-Game-3-kick-off-time-what-time-will-the-rugby--915ea8f04159406c8f74fd977bf02dba

https://www.game.tv/tournaments/Watch-State-of-Origin-2020-Catch-Up-TV--6f5a9345b0a24d5b94201f47e73a692f
https://www.game.tv/tournaments/Rugby-State-of-Origin-2020-Game-3-start-time-how-to-watch-what--33d443581bf549bdb1cd5c5abfc4f5c9
https://www.game.tv/tournaments/How-to-watch-State-of-Origin-Game-3-live-in-Australia--34559b02093c4475ac8d959723b30412
https://www.game.tv/tournaments/State-of-Origin-game-3-Suncorp-Stadium-capacity-crowd-to-give-Queensland-edge-over-NSW--cc675bcb299047deba89a8ac032e4384
https://www.game.tv/tournaments/State-of-Origin-2020-Game-3-Live-Stream-Free-Rugby-Game--9c6a840a933b430995e62d728772f36d