What does express.static() return?
Middleware function, serve static
What is the local __dirname variable in a Node.js module?
The directory name of the current module. This is the same as the path.dirname() of the __filename.
It starts with / so it is absolute file path since it starts at the root of the file system
What does the join() method of Node’s path module do?
The path.join() method joins all given path segments together using the platform-specific separator as a delimiter, then normalizes the resulting path.