---
title: "What is JavaScript?"
description: "JavaScript is a scripting language for dynamic websites. In this introduction, you will learn about the history, features, and uses of JavaScript in…"
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---

# What is JavaScript?

JavaScript is a scripting language for dynamic websites. In this introduction, you will learn about the history, features, and uses of JavaScript in…

## What is JavaScript?

JavaScript is a widely used scripting language that was originally developed to make websites dynamic and interactive. It allows code to be executed directly in the user's web browser, extending the capabilities of HTML and CSS. JavaScript is now used in a variety of environments, such as on the server side through Node.js, in mobile apps or for developing cross-platform desktop applications. History and Development of JavaScript JavaScript was developed in the 1990s by Brendan Eich and originally released under the name Livescript. The language was later renamed JavaScript to capitalize on the increasing popularity of the Java programming language. Since then, JavaScript has continued to develop and become established. Today there are numerous frameworks and libraries that make web-based programming much easier. Characteristics and Usage of JavaScript JavaScript runs on the client side, which means that the code is executed in the user's web browser and not on the web server where the web page is hosted. This enables a fast response time and low load on the server. With JavaScript, developers can implement interaction options such as animations, user input validation, slide or click effects on websites. A special feature of JavaScript is event-driven programming. This means that certain functions (so-called event handlers) are only executed when a specific event occurs, for example by clicking a button or moving the mouse over a link. JavaScript and web development In web development, JavaScript plays a crucial role in the implementation of user-friendly and dynamic websites. Together with HTML and CSS, JavaScript forms the foundation of front-end development. By using JavaScript frameworks like Angular, React or Vue.js, developers can build complex and powerful web applications. JavaScript also plays a role in the area of ​​search engine optimization (SEO), as modern search engines are now able to crawl and index JavaScript-based websites. However, it is important to ensure the best possible performance and user experience by ensuring that the website remains functional without JavaScript and that the relevant content is accessible to search engines.

JavaScript is a widely used scripting language that was originally developed to make websites dynamic and interactive. It allows code to be executed directly in the user's web browser, extending the capabilities of HTML and CSS. JavaScript is now used in a variety of environments, such as on the server side through Node.js, in mobile apps or for developing cross-platform desktop applications.

## History and development of JavaScript

JavaScript was developed by Brendan Eich in the 1990s and originally released under the name Livescript. The language was later renamed JavaScript to capitalize on the increasing popularity of the Java programming language. Since then, JavaScript has continued to develop and become established. Today there are numerous frameworks and libraries that make web-based programming much easier.

## Features and usage of JavaScript

JavaScript runs on the client side, meaning that the code runs in the user's web browser and not on the web server that hosts the website. This enables a fast response time and low load on the server. With JavaScript, developers can implement interaction options such as animations, user input validation, slide or click effects on websites.

A special feature of JavaScript is event-driven programming. This means that certain functions (so-called event handlers) are only executed when a specific event occurs, for example by clicking a button or moving the mouse over a link.

## JavaScript and web development

In web development, JavaScript plays a crucial role in creating user-friendly and dynamic websites. Together with HTML and CSS, JavaScript forms the foundation of front-end development. By using JavaScript frameworks like Angular, React or Vue.js, developers can build complex and powerful web applications.

JavaScript also plays a role in the area of ​​[search engine optimization](/en/services/search-engine-optimization-seo/) (SEO), as modern search engines are now able to crawl and index JavaScript-based websites. However, it is important to ensure the best possible performance and [user experience](/en/services/webdesign-and-conception/) by ensuring that the website remains functional without JavaScript and that the relevant content is accessible to search engines.