That's because most of the time when you require something, it is a gem,
and gems are installed in specific directories that ruby searches when
you require something. You can see a list of the directories ruby
searches when you require something by doing this:

p $LOAD_PATH

7Stud was very clear...

The gems are installed to a folder/directory that is in your environment
path.

So you won't see this in a gem, unless someone is unaware of what they are
doing, and it would also require you to run that specific gem in some
specific folder or directory.

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