In the simplest terms, the JK modules, or mod_jk, are conduits between a Web server and the Tomcat JSP/servlet container. They replace the previous Web server module, mod_jserv, which had many shortcomings. The new JK modules include support for a wider variety of Web servers, better SSL support, support of the AJP13 protocol, and support for the entire Tomcat series from 3.2.x to 5.x.
One thing that Tomcat and Apache do together is bring you Artima.com. It's a nice combination, though I have been having trouble with Tomcat crashing:
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