You can also pass parameters into a template call to change how it renders. This is done by appending a pipe to the template name and then providing a pipe-delimited list of name-value pairs. This is easier to see in an example:
{{TemplateName|Parameter1=foo|Parameter2=baz}}
In this case, the template named "TemplateName" will be called, and two parameters ("Parameter1" and "Parameter2") will be passed in with the values "foo" and "baz", respectively. The TemplateName template can now use parameters using a triple-brace syntax. If the text of TemplateName were:
This is parameter 1: {{{Parameter1}}}
This is parameter 2: {{{Parameter2}}}
Then the output of the above template call would be:
This is parameter 1: foo
This is parameter 2: baz
Template calls don't need to be constrained to a single line, as in the above example; in fact, they're usually easier to read when broken up:
Template:TemplateName
The <noinclude> template call renders the enclosed information only on the template's editing page. This is useful for providing additional information about creating and using a template. For example,
<noinclude>
This is help text
</noinclude>
"This is help text" will not be rendered when the template is included, but will appear on the page [[template:templatename]]