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Java is a programming language and a platform. Java is a high level, robust, object-oriented and secure programming language. Java was developed by Sun Microsystems (which is now the subsidiary of Oracle) in the year 1995. James Gosling is known as the father of Java. Any hardware or software environment in which a program runs is known as a platform. Since Java has a runtime environment (JRE) and API, it is called a platform.

Use 
One of the most widely used programming languages, Java is used as the server-side language for most back-end development projects, including|
Web Applications: Java is used to develop server-side components of web applications and dynamic websites.
Enterprise Applications: Java is used to develop enterprise-level applications such as customer relationship management (CRM) systems, human resource management systems (HRMS), and supply chain management systems.
Mobile Applications: Java is used to develop native mobile applications for Android devices.
Desktop Applications: Java can be used to develop desktop applications for Windows, Mac, and Linux operating systems.
Gaming: Java is used to develop desktop and online games, as well as for developing game engines.
Big Data: Java is used in big data processing and analysis, due to its ability to handle large amounts of data efficiently.
Embedded Systems: Java is used to develop embedded systems, such as those used in televisions, Blu-ray players, and other consumer electronics devices.

Software
Java is developed using the IntelliJ idea. It has many developing tools however e.g. 
Eclipse: It is a popular open-source Java Integrated Development Environment (IDE) used for developing Java applications.
IntelliJ IDEA: It is a commercial Java IDE developed by JetBrains. It is known for its advanced code analysis and refactoring tools.
NetBeans: It is another open-source Java IDE that provides a wide range of tools for Java development, including code editing, debugging, and profiling.
jEdit: It is a Java-based text editor that supports many programming languages and has a large number of plugins available for extended functionality.
BlueJ: It is a simple and lightweight Java IDE designed specifically for teaching and learning Java programming.