Message "the term 'ng' is not recognized as the name of a cmdlet"

Today, while working through some basic AngularJS introduction, I ran into a problem.

I opened PowerShell to get going on the project. NPM worked.

I was able to install Angular using:

npm install -g @angular/cli


Anytime I tried to run ng, I would get:

the term 'ng' is not recognized as the name of a cmdlet
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