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Refer to the file -
vendor\magento\module-ui\view\base\requirejs-config.js
You will see code in map like -
uiCollection: 'Magento_Ui/js/lib/core/collection',
uiComponent: 'Magento_Ui/js/lib/core/collection',
What is the difference between these two and how are they mapped?
My take on this is a UI component is the name given to a UI element or collection of elements, such as a form, button, modal etc.
And the UI Collection is the Javascript you use to build a UI component (or collection of them).
I'm not too sure why there are two files mapped to the same file, this doesn't sound great practice as it promotes inconsistency.
More info can be found in the docs:
