Jakarta Server Pages (formerly JavaServer Pages) is a Java standard technology that developers use to write dynamic, data-driven web pages for Java web applications. JSP is built on top of the Java Servlet (aka Jakarta Servlet) specification and is one of the Java web technologies included for ongoing support and upgrades in Jakarta EE.
JSP and servlets typically work together, especially in older Java web applications. From a coding perspective, the most obvious difference between JSP and servlets is that with servlets you write Java code and then embed client-side markup (like HTML) into that code.
