If this is a testing site with duplicate content, you may want to put the real site domain here so search engines don't index the testing site. In complex perspective setups using multiple domains, you may want more control on which canonical domain is advertised.
On this #tikiexpresstutorial, using #tiki19 I’ll show you:
How to enable a feature from the Control Panels
How to enable a Global Feature from the features panel
How to enable an Interface feature
A quick overview of the Programmer features
And where to look for feature options