Servlets directly interact with the JavaServer Pages (JSP) container.

The term for a unique identifier generated by the server and sent to the client to maintain a session is a Cookie.

When using HttpServletResponse's sendRedirect, the session data is typically lost because it involves a new request. In contrast, RequestDispatcher's forward method allows the sharing of session data, maintaining it throughout the forwarding process, providing a more seamless user experience with consistent session information.

The Domain attribute specifies the subset of URLs to which a cookie will be sent.

The method sendRedirect is used when the servlet needs to redirect the client to a different domain.

For optimizing a web application with heavy presentation logic, JSP (JavaServer Pages) is more suitable. JSP is specifically designed for creating dynamic web pages with a focus on presentation logic, making it easier to manage and optimize the presentation layer of a web application.

The primary purpose of cookies in web applications is to store user preferences, enabling a personalized and persistent experience for users.

Servlets are often used for processing and sending HTML to the client.

Servlet initialization parameters are defined using the tag in the web.xml file.

For efficient handling of large file uploads in a servlet, one should implement MultipartRequest instead of using standard getParameter methods for better control and performance in processing multipart/form-data requests.