Assembly: Microsoft.SharePoint (in Microsoft.SharePoint.dll)
If the SPWebTemplate represents a site definition configuration, this property is the value of the DisplayCategory attribute of a Configuration element in a WebTemp*.xml. (See WebTemp.xml for more information.)
For the configurations in the MPS site definition that ships with SharePoint Foundation, WebTemp.xml defines this property as "Meetings". For the configurations in the STS, BLOG, SGS, and legacy WIKI site definitions, WebTemp.xml defines this property as "Collaboration". (The CENTRALADMIN and TENANTADMIN site definitions are hidden anyway, so is null.)
If you create your own customized site definition, you can use any string you want for (by setting the DisplayCategory attribute of the <Configuration> element in a custom WebTemp*.xml file) and you do not have to use the same string for each configuration within your definition.
If the SPWebTemplate represents a Web template, this property corresponds to the DisplayCategory attribute in a WebTemplate element in a elements.xml file contained in the .wsp file that stores the Web template. The value will default to "Custom" when the Web template is created in the UI. You will need to edit the .wsp file to change it. For more information, see How to: Create a Custom Web Template.