Earlier Java was only used to design and program small computing devices, but it was later adopted as one of the platform-independent programming languages, and now according to Sun, 3 billion devices run Java. Java is one of the most important programming languages in today's IT industries.
JSP - In Java, JSP (Java Server Pages) is used to create dynamic web pages, such as in PHP and ASP.
Applets - Applets are another type of Java program that are implemented on Internet browsers and are always run as part of a web document.
J2EE - Java 2 Enterprise Edition is a platform-independent environment that is a set of different protocols and APIs and is used by various organizations to transfer data between each other.
JavaBeans - This is a set of reusable software components that can be easily used to create new and advanced applications.
Mobile - In addition to the above technology, Java is widely used in mobile devices nowadays, and many types of games and applications are being made in Java