What is JavaScript? A Beginner Friendly Introduction

What is JavaScript?

JavaScript is one of the most popular programming languages used to create interactive and dynamic websites. It allows developers to add functionality to web pages such as form validation, animations, API calls, and real-time updates.

  • JavaScript is a single-threaded language that executes one task at a time.
  • It is an interpreted language which means it executes the code line by line.

Today, JavaScript is used by millions of developers around the world and it powers many modern web applications including social media platforms, dashboards, and online tools.

If you want to become a web developer, learning JavaScript is essential.

Why JavaScript is Important

JavaScript plays a very important role in modern web development. It works together with HTML and CSS to build fully functional websites. Here is how these three technologies work together:

  • HTML: is the markup language that we use to structure and give meaning to our web content, for example defining paragraphs, headings, and data tables, or embedding images and videos in the page.
  • CSS: is a language of style rules that we use to apply styling to our HTML content, for example setting background colors and fonts, and laying out our content in multiple columns.
  • JavaScript: is a scripting language that enables you to create dynamically updating content, control multimedia, animate images, and pretty much everything else. (Okay, not everything, but it is amazing what you can achieve with a few lines of JavaScript code.)

Features of JavaScript

Following are the key features of JavaScript that make it a powerful language for web development:

  • Client-Side Scripting: JavaScript runs on the user's browser, so has a faster response time without needing to communicate with the server.
  • Event-Driven: Responds to user actions (clicks, keystrokes) in real-time. Asynchronous: It can handle tasks like fetching data from servers without freezing the user interface.
  • Asynchronous: It can handle tasks like fetching data from servers without freezing the user interface.