In the introduction, I stated that the techniques that you are now learning are not frequently required. That was true, except for this one topic. Templates are actually a cornerstone of configuration management with Puppet.
Templates are an alternative way to manage configuration files, or any files really. You have synchronized files from the master to an agent that handled some Apache configuration settings. These are not templates, technically. They are merely static files that have been prepared and are ready for carbon copying.
These static files suffice in many situations, but sometimes, you will want the master to manage very specific configuration values for each agent. These values can be quite individual. For example, an Apache server usually requires a MaxClients setting. Appropriate values depend on many aspects, including hardware...
