Final answer:
To make a node module available externally, the 'module.exports' or 'exports' object is used to expose functions or objects that can be required by other Node.js files.
Step-by-step explanation:
To make a node module available externally, you use the module.exports or exports object. This is done typically at the bottom of a Node.js module file, allowing you to specify which functions, objects, or data you want to be accessible to other files that require your module.
For example, if you have a function myFunction that you want to make available outside the module, you would add module.exports.myFunction = myFunction; at the end of your file.