To install Tomcat, simply download a binary distribution from http://tomcat.apache.org and unpack it into some directory, say, C:\apache-tomcat-6.0. The most recent version 6 should work fine, but if there are problems, version 5.5 is a very well tested alternative.
Once Tomcat is downloaded, we need to tell Eclipse where we have put it—but that will be done while configuring the project.