What is difference between local and global Node package installation?

I ask this question because I have been installing nodemon with npm and I see the results of installing through the suggested command at first sight, at the right side of the screen:

npm i nodemon

It is different from the installation instructions you can read above, on the Installation section. There we see:

global installation:

npm install -g nodemon

install nodemon as a local project dependency:

npm install --save-dev nodemon

The thing is, what is difference between

npm i nodemon

and

npm install -g nodemon

When I use the first command it tells me typical "nodemon is not recognized as internal or external command, operable program or batch file". To solve it I must install globally.

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