What is "fluid.defaults()"?

Q. What's fluid.defaults()?
A.
fluid.defaults() stores and retrieve a component's default settings. "Settings" are the options that are basically configuration to a components. On run time, components settings are generated by merging the default settings (which is by fluids.defaults()) and the users' instance of option (which is the last argument to a component creator).
The fluid.defaults() API can be found here.