What is JavaScript?

JavaScript is a versatile, high-level programming language that runs in web browsers and on servers. It's the core language of the web alongside HTML and CSS. JavaScript enables interactive, dynamic behavior in web pages such as dropdowns, sliders, modals, form validation, and more.

🌐 JavaScript on the Web

JavaScript can modify HTML and CSS on the fly using the DOM (Document Object Model). It’s used for tasks like:

• Validating form inputs
• Creating animations and visual effects
• Fetching data with AJAX or Fetch API
• Building Single Page Applications (SPAs)
• Handling user interactions and events

⚙️ JavaScript Basics

Here’s a simple JavaScript snippet:

<script>
  function greet(name) {
    alert('Hello, ' + name + '!');
  }

  greet('World');
</script>

📦 Where JavaScript Runs

JavaScript originally ran only in browsers, but thanks to Node.js, it can now run on servers as well. This means JavaScript is both a client-side and server-side language.

🚀 Modern JavaScript Uses

JavaScript is the foundation of many frameworks and tools like:

• React, Vue, Angular (frontend frameworks)
• Node.js + Express (backend)
• Electron (desktop apps)
• React Native (mobile apps)

🧠 Summary

JavaScript is the scripting language that powers the interactive web. Whether you're building simple animations or full-stack applications, learning JavaScript is essential for modern developers.