Servlets are Java-based server-side programs that run on a web server to dynamically generate web content. They can be used to handle HTTP requests and responses, process form data, generate dynamic web pages, and interact with databases and other resources.
Servlets are typically packaged as Java class files and deployed as part of a web application. When a client sends an HTTP request to the server, the server invokes the appropriate servlet to handle the request. The servlet then generates a response and sends it back to the client.
Servlets are highly scalable and can handle multiple requests simultaneously. They can also be used with other Java technologies such as JSP (JavaServer Pages) and JDBC (Java Database Connectivity) to create dynamic web applications.
To create a servlet, you typically extend the
HttpServlet class and override the appropriate methods to handle requests and generate responses. You can then compile the servlet class and deploy it on a web server such as Apache Tomcat or Jetty.