Servlet container, also known as Servlet engine, is an integrated set of objects that provide a run time environment for Java Servlet components. It is a system that manages Java Servlet components on top of the Web server to handle the Web client requests.
Servlets provide a component-based, platform-independent method for building Webbased applications, without the performance limitations of CGI programs. Servlets have access to the entire family of Java APIs, including the JDBC API to access enterprise databases.
Simply put, a Servlet is a class that handles requests, processes them and reply back with a response. For example, we can use a Servlet to collect input from a user through an HTML form, query records from a database, and create web pages dynamically. Servlets are under the control of another Java application called a Servlet Container.
A servlet is a Java programming language class that is used to extend the capabilities of servers that host applications accessed by means of a request-response programming model.
What Is a Servlet? - The Java EE 5 Tutorial - Oracle
A Servlet is a Java class that runs on a server, processes requests (usually HTTP), and generates dynamic responses. It acts as a bridge between a client (browser) and a server, facilitating interaction in web applications.
Java Servlet technology is used to create a web application (resides at server side and generates a dynamic web page). The Java Servlet technology is robust and scalable because of java language.
A servlet is a Java programming language class used to extend the capabilities of servers that host applications accessed by means of a request-response programming model. Although servlets can respond to any type of request, they are commonly used to extend the applications hosted by web servers.