Java Web is actually the sum of technologies, and the Web is regarded as a container, which is mainly realized by JavaEE technology. Using various middleware (SSH, etc. ), JavaWeb can actually do anything. You can make a software, an ERP, a webpage and even an online game through JavaWeb. There is no specific category. Coupled with the portability of Java, it is now widely used in the development of various ERP and large interactive websites. To put it bluntly, it is the same as the GUI in JavaSE, except that the JavaSE GUI is displayed in the form of a desktop, just like the ordinary version of QQJavaWeb is displayed in the form of a webpage. It's like a web version of QQ.