JavaScript is a high-level programming language that follows the ECMAScript standard. Originally designed as a scripting language for websites, it has evolved into a widely adopted general-purpose programming language and is currently the most popular programming language in use. JavaScript is usually found running in a web browser as interactive or automated content, ranging from popup messages and live clocks to large web applications. It is also commonly used in server-side programming through platforms like Node.js, or “embedded” in non-JavaScript applications where the base programming language lacks the high-level functionality that JavaScript offers.
Despite the similarities in name and syntax, JavaScript is not related to the programming language Java. Though the names of both languages are trademarks of Oracle Corporation, the two languages follow different design principles and are actively developed by unrelated organizations.
Use:
JavaScript is typically inserted into HTML when used on the web, either directly in the file within an HTML tag or linked to a separate file containing the script.
As a full-featured scripting language, JavaScript can provide functionality to a website. Examples include:
- Using AJAX to load content without refreshing the website.
- Changing HTML through the Document Object Model (DOM).
- Modifying CSS.
- Validating form inputs and sending them.
- Tracking users as they navigate the website.