An applet is a small application or programme written in the Java programming language. It is designed to be embedded and executed within a web page, typically using a web browser that supports Java applets.
Key points about applets:
- Java-Based Programmes: Applets are written in Java, a versatile programming language known for its platform independence. They are compiled into bytecode that can run on any device with a Java Virtual Machine (JVM).
- Embedded within Web Pages: Applets are intended to be embedded within HTML (Hypertext Markup Language) pages and run in a restricted environment known as the applet sandbox within the web browser. They can interact with the web page’s content and respond to user actions.
- Rich Functionality: Applets were popular in the early days of the internet because they offered a way to create interactive and dynamic content within web pages. They could be used for animations, games, multimedia, data visualisation, and other interactive features.
- Security Constraints: Applets run within a sandboxed environment in the web browser, which imposes certain security restrictions. This restricted environment prevents applets from accessing files or system resources on the user’s computer without explicit permission.
- Decline in Usage: Over time, due to security concerns, changes in web standards, and the emergence of other web technologies like JavaScript, HTML5, and CSS3, the use of Java applets has significantly declined. Many modern web browsers have dropped support for Java applets or require additional permissions to run them.
- Alternatives: Modern web development now favors other technologies like JavaScript frameworks (such as React, Angular, or Vue.js), HTML5 canvas for graphics, and CSS animations to achieve similar or even more advanced interactive functionalities without relying on Java applets.