Absolute modules are modules that Node finds through its internal node_modules, or modules built into Node such as fs.
A relative module will require to point to a JavaScript file in a relative working directory.
For example, we create three files fileOne.js, fileTwo.js, index.js in the same directory
The content in fileOne.js is
console.log('this is fileOne');
The content in fileTwo.js is
console.log('this is fileTwo');
The content in index.js is
require('fileOne');
require('fileTwo');
Run the index.js file
As a result, fileOne and fileTwo could not be found, because they are not installed through NPM, nor in the node_modules directory, and there is no module with this name in Node's own modules.
If we want it to show up correctly, we just need to prefix require with ./
require('./fileOne');
require('./fileTwo');