Asynchronous JavaScript: How Non-Blocking Operations Work

Some JavaScript tasks, such as fetching data from an API or waiting on a timer, take time to finish. Asynchronous JavaScript lets the language handle these tasks without halting other code from running. Synchronous code executes line by line in order, while asynchronous code can schedule work, like a setTimeout callback, to run later. The article's example shows a log statement printing before a delayed callback, illustrating this behavior. Common uses include fetching API data, loading products on shopping sites, sending login details, uploading files, and communicating with databases through a backend.