Difference between Javascript async functions and Web workers?

Question

Threading-wise, what\'s the difference between web workers and functions declared as

async function xxx()
{
}

?

I am aware web worker

Answer 1

I want to add my own answer to my question, with the understanding I gathered through all the other people's answers:

Ultimately, all but web workers, are glorified callbacks. Code in async functions, functions called through promises, functions called through setInterval and such - all get executed in the main thread with a mechanism akin to context switching. No parallelism exists at all.

True parallel execution with all its advantages and pitfalls, pertains to webworkers and webworkers alone.

(pity - I thought with "async functions" we finally got streamlined and "inline" threading)