What Is Vue.js and Why It Is Used

When building web pages with JavaScript, you often need to manually select elements, listen for events, and update the page content.

const button = document.querySelector(".btn");
const title = document.querySelector("h1");

button.addEventListener("click", () => {
  title.textContent = "Clicked!";
});

This approach works for small features, but as applications grow, the code becomes harder to manage and maintain.

Vue.js is a JavaScript framework that simplifies this process. Instead of manually updating the page, you describe how the interface should look based on data, and Vue automatically keeps it in sync.

// JS
const message = "Hello Vue";

// HTML
<h1>{{ message }}</h1>

When the data changes, the UI updates automatically.

Vue is built around a few core ideas:

• Reactive data: the UI updates when data changes;
• Components: the interface is split into reusable parts;
• Declarative rendering: you describe what the UI should look like.

Vue helps you build interactive applications in a more structured and scalable way compared to plain JavaScript.