{disambiguate=JavaScript}

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/async_function

`async` is all present in <JavaScript> for two reasons:
* you make network requests all the time
* JavaScript is single threaded, so if you are waiting for a network request, the UI freezes, see remarks on the deprecation of synchronous HTTP request at: https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/Synchronous_and_Asynchronous_Requests

However, it is also <Hell>: <how to convert async to sync in JavaScript>.
