JavaScript, often abbreviated JS, is a programming language that is one of the core technologies of the World Wide Web, alongside HTML and CSS. Over 97% of websites use JavaScript on the client side for web page behavior, often incorporating third-party libraries.
What can JavaScript be used for? Or, what can't JavaScript be used for?

cite:JavaScript on WikiPedia«

[Understanding the Core Technologies]

JavaScript: The foundational programming language of the web. It adds interactivity, handles logic, and manipulates the DOM directly.
jQuery: A fast, feature-rich JavaScript library. It acts as a wrapper, abstracting away complex, browser-specific JavaScript syntax so you can select elements, handle events, and write animations with fewer lines of code
Ajax (Asynchronous JavaScript and XML): A set of web development techniques used to exchange data with a server in the background. It updates parts of a web page dynamically without requiring a full page reload.

[Why We Use Them Together]

While you can write Ajax natively using raw JavaScript (via the XMLHTTPRequest API), jQuery simplifies the process considerably. Together, they allow you to build fluid, highly responsive single-page applications.

For example, using jQuery's simplified Ajax method, you can retrieve user data from a server and display it on your screen in just a few lines of code:

[JavaScript - AJAX Example]

CFFCS | CarrzSynEdit: | JS (JavaScript)

$.ajax({
    url: 'https://example.com',
    type: 'GET',
    dataType: 'json',
    success: function(response) {
        // Manipulate the DOM with jQuery
        $('#user-info').html('Welcome, ' + response.name);
    },
    error: function(xhr, status, error) {
        console.error('Error fetching data:', error);
    }
});