Java Servlet
Java Servlet is a server-side Java programming technology that extends the capabilities of servers to host applications accessible via a request-response programming model. It provides a component-based, platform-independent method for building web applications, handling HTTP requests and generating dynamic content. Servlets run inside a servlet container (like Apache Tomcat) and are part of the Java EE (Enterprise Edition) specification.
Developers should learn Java Servlet when building dynamic, scalable web applications in Java, especially for enterprise-level systems that require robust server-side processing, session management, and integration with databases. It's essential for creating web-based interfaces for Java applications, handling form submissions, and implementing MVC (Model-View-Controller) architectures in frameworks like Spring MVC. Use cases include e-commerce sites, banking systems, and any web service that needs to process user input and generate custom responses.