Node.js is a JavaScript runtime built on Chrome's V8 JavaScript engine

Node.js is a JavaScript runtime built on Chrome's V8 JavaScript engine. It allows developers to run JavaScript on the server side. Here is a list of some commonly used Node.js functions:

1. require(): This function is used to import modules and other JavaScript files in a Node.js application.

2. console.log(): This function is used to print messages to the console for debugging and logging purposes.

3. setTimeout(): This function is used to delay the execution of a function for a specified amount of time.

4. setInterval(): This function is used to execute a function repeatedly at a specified interval.

5. Buffer.from(): This function is used to create a new Buffer object from a provided string or array.

6. process.exit(): This function is used to exit the current process.

7. process.cwd(): This function is used to get the current working directory of the Node.js process.

8. process.on(): This function is used to register an event listener on the process object.

9. process.env: This object contains environment variables of the current Node.js process.

10. global: This object contains global objects, functions, and variables of Node.js.

Please note that this is only a subset of the functions available in Node.js, and new functions may be added in future releases.