Answers for "what is npm global install"

npm install package globally

#Syntex
npm install packagename -g

#example
npm install express -g

install npm package globally

npm install package-name -g

what is npm global install

flag for npm install ... installs a module globally on your system.
good for tools, utilities you will use in more than one project
--global flag when running the install command
it puts the module in a system directory
rather than locally (to the current directory).

install an npm package

npm install package-name

To save as a dependency:
npm install package-name --save