HTML works together with other technologies to create modern web applications. While HTML defines the structure of a page, CSS controls the visual presentation and JavaScript adds interactive behavior. Understanding this relationship is essential for building functional and visually appealing web pages.

Example: HTML with CSS and JavaScript

<h1 id="title">Hello</h1>

<script>
document.getElementById("title").style.color = "blue";
</script>

In this example, JavaScript changes the color of the heading.