Are all functions asynchronous in node.js?

Question

Node.js

I started learning node.js and after PHP my head is a mess. I understand asynchronous programming. Did I understand correctly that in node any function is asynchronous and is executed in parallel with the code from where it was called?

Answer 1

No.
Asynchronous there are only I / O functions (file system, network, etc.) and some using external libraries (zlib). And yet most of the functions have a synchronous version (fs.readFile/fs.readFileSync).
Everything else is normal functions like url.parse, console.log etc.