JDK: Java Development Kit (Java Development Pack)
JSDK: Java Servlet Development Kit (Java Servlet Development Pack)
Jswdk: JavaServer Web Development Kit
JDK is a must-have tool for Java development. JSDK is a tool for developing a servlet. JSWDK is a JSDK enhancement, including JSP development tools.
Now, Sun has stopped developing JSDK and JSWDK, providing development support for servlet and JSP by Jakarta.apache.org Tomcat. JSDK.jar also renamed servlet.jar.
