Azure – What is Powershell (dotnet global)

I was leaning a powershell tutorial where the following code was written:

dotnet tool install --global PowerShell

I tried the code — and found that it installed a something named Powershell(dotnet global)

My question is it is another version of powershell or module or tool or what?
And another question is that without this Powershell(dotnet global) – Will I not be able to install any module?

I am using Windows Terminal and that thing shows like the below picture