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Java Servlets are Sun's Java-based solution to the problems with CGI.

Later, we'll see that Java Server Pages (JSPs) and servlets work together to provide an even better solution.

In order to use Servlets or JSPs, you must have a web server with a Java servlet 'container'.  There are a number of free servlet containers;  the most popular, at least for development purposes, is the Apache Foundation's Tomcat.