Feature Stapling in SharePoint 2010

Feature stapling helps us to enable the feature at following scope
1. Web
2. Site
3. Web application
4. Farm

Stapling required atleast two features
1. Feature that needs to be stapled
2. Feature to staple at different scope.
Obviously the stapler scope should be above the feature being stapled.

To activate the feature for type of sites in web application, we need to associate stapling a feature to global site definition(TemplateName=" GLOBAL") and blank site (TemplateName=" STS#1").

Elements file of Stapler feature will look like

<Elements xmlns="http://schemas.microsoft.com/sharepoint/">
<FeatureSiteTemplateAssociation   Id="c4386b61-3aa0-4017-98c4-0feb17a97cb5" TemplateName=" GLOBAL" />
<FeatureSiteTemplateAssociation   Id="c4386b61-3aa0-4017-98c4-0feb17a97cb5" TemplateName=" STS#1" />
</Elements>

Solution example