What is the primary function of the JavaScript 'alert()' method?

The primary function of the JavaScript 'alert()' method is to display a pop-up message to the user. When invoked, 'alert()' generates a modal dialog box that presents a specified message and an "OK" button for the user to dismiss the dialog. This is often used to provide notifications, warnings, or important information that requires the user's attention before they can continue interacting with the webpage.

In contrast, logging information to the console is accomplished through the 'console.log()' method, which doesn't generate a visual popup but rather outputs data for debugging purposes. Creating asynchronous requests is handled through methods like 'fetch()' or 'XMLHttpRequest', enabling communication with servers without blocking the user's interaction with the page. Lastly, getting input from the user typically involves the use of prompts or forms, such as the 'prompt()' method, which allows for user input collection, rather than simply displaying messages like 'alert()'.