A JSP (JavaServer Page) is a web page that contains Java code and is compiled into a Servlet before it is executed. A JSP is typically used to generate dynamic content for a web page, such as a database query or a user login.
A Servlet is a Java class that is executed when a request is made to a web server. A Servlet is typically used to process requests from a web page, such as a form submission or a login request.
For example, a JSP might be used to generate a web page that displays a list of products from a database. The JSP would contain the code to query the database and output the results in HTML. The Servlet would be used to process the form submission from the web page, such as when a user adds a product to their shopping cart. The Servlet would then update the database accordingly.