Getting Started with JavaScript: The Language That Powers the Web — Visakh Vijayan
Getting Started with JavaScript: The Language That Powers the Web
Learn what JavaScript is, why it powers the web, how it works with HTML and CSS, where it runs, and how to write your first JavaScript code.
June 4, 2026
Getting Started with JavaScript: The Language That Powers the Web
If you've ever clicked a button on a website, filled out a form, opened a menu, or watched content update without refreshing the page, you've interacted with JavaScript.
JavaScript is one of the most important programming languages in the world today. In fact, it is consistently ranked as the most popular programming language, and it powers much of the modern web.
In this post, we'll learn what JavaScript is, where it runs, and how to start writing your first JavaScript code.
Why Learn JavaScript?
The web is built on three core technologies:
Technology
Purpose
HTML
Structure
CSS
Styling
JavaScript
Interactivity
Think of building a house:
HTML is the structure (walls, doors, rooms)
CSS is the paint, furniture, and decoration
JavaScript makes things work (lights, switches, doors that open)
Without JavaScript, websites would mostly be static pages.
JavaScript allows us to:
Respond to button clicks
Validate forms
Create animations
Update content dynamically
Communicate with servers
Manipulate the page using the DOM
What is JavaScript?
JavaScript is a:
High-level programming language
Object-Oriented Programming (OOP) language
Dynamic language
Multi-paradigm language
As beginners, the important thing to remember is:
JavaScript is the programming language that brings web pages to life.
Where Can JavaScript Run?
Many beginners think JavaScript only works inside browsers.
That's how JavaScript started, but today it can run in many places.
Inside the Browser
Every modern browser contains a JavaScript engine.
Examples include:
Chrome → V8 Engine
Firefox → SpiderMonkey
Safari → JavaScriptCore
The browser executes JavaScript and allows it to interact with web pages.
Outside the Browser
JavaScript can also run outside browsers using technologies like:
Node.js
Bun
Deno
For example, Node.js allows developers to build:
Web servers
APIs
Command-line tools
Real-time applications
This means JavaScript can now be used for both frontend and backend development.
The Browser Developer Console
The easiest place to experiment with JavaScript is the browser's Developer Console.
Open any website and:
Chrome
Right Click → Inspect → Console
Or:
F12
You can immediately execute JavaScript code.
Example:
2 + 3
Output:
5
The console evaluates the expression and displays the result.
This makes it a great playground for learning JavaScript.
ECMAScript (ES) — The Standard Behind JavaScript
You will often hear terms such as:
ES5
ES6
ES2015
ECMAScript
What do they mean?
ECMAScript is the official specification that defines how JavaScript should work.
JavaScript implementations (such as browsers and Node.js) follow this specification.
A major update arrived in 2015:
ECMAScript 2015
↓
ES2015
↓
ES6
All three names are commonly used to describe the same version.
Writing JavaScript Inside HTML
JavaScript can be written directly inside an HTML file using the <script> tag.