Back to course

Introduction: What is JavaScript and Why Learn It?

JavaScript: The Complete '0 to Hero' Beginner Course

1. What is JavaScript?

JavaScript (often abbreviated as JS) is one of the three core technologies of the World Wide Web, alongside HTML and CSS. Initially, JS was used exclusively for making web pages interactive. Today, it has exploded in popularity and capability, being used in:

  1. Front-end Web Development: Making websites interactive, handling user clicks, form submissions, and updating content dynamically.
  2. Back-end Server Development: Using environments like Node.js to build fast and scalable servers.
  3. Mobile App Development: Using frameworks like React Native.
  4. Desktop Applications: Using frameworks like Electron.

Key Facts about JavaScript

  • Interpreted Language: Unlike compiled languages, JS code is interpreted (read and executed line-by-line) by the JavaScript Engine (like Google's V8 or Mozilla's SpiderMonkey).
  • High-Level: It abstracts away complex computer details, making it easier for humans to write.
  • Case-Sensitive: myVariable is different from MyVariable.

Prerequisites

While this course starts from zero, having a basic understanding of HTML and CSS is highly recommended, as JavaScript is primarily used to interact with them.