What does "build" mean?


In this exercise, we run the build script using the command
npm run build

What does “build” mean?


The word “build” can be used to describe what it does, which is constructing, or “building”, a project and preparing any tasks, such as updating or installing packages.

Running the command will run whatever value is assigned to the key "build" in the package.json file. So, if it was set to
"build": "babel src -d lib"

then running
npm run build

will run the command
"babel src -d lib".