Ethernet Switch- what's the point?


I run an Ethernet cable between my router (standard issue from Verizon) and my streaming transport. I note that some use an ethernet switch between between the router and streamer. Assuming I got that right, what is the point- what does a good switch do? I've been into audio since the 70's but when its comes to streaming, I'm definitely a newbie- 

Thanks all!

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@12many i know, that is not the point, the point is to counter all these people are telling people to spends thousands on dollars on things that doesn’t work. So hopefully people don’t go wasting their money. 

@yoyoyaya and we are back to bias.

the facts of how a switch works doesn’t change. It is not an intelligent device that can make decisions based on what is transported via the switch. 

@fredrik222 no one is saying spend thousands of dollars, fiber is cheap. Only person spreading false information is you. Also your grammar is atrocious, and why should you care how anyone spends their hard earned cash? 

@12many I would hardly call it persistence, more like trolling as this is the only subject matter he contributes to. And reading through his archives he is consistently chirping off on it. One trick pony. 

  •  i know, that is not the point, the point is to counter all these people are telling people to spends thousands on dollars on things that doesn’t work. So hopefully people don’t go wasting their money.