Intent.setData vs Intent.putExtra

Question

I\'m trying to follow this tutorial:

http://www.vogella.com/articles/AndroidCalendar/article.html

I understand what putExtra does

but I fail to under

Answer 1

setData() is used for the Android System to find an application component that matches the data attribute in implicit intent.

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putExtra() is mainly used to pass some information to the selected application component,by the Android system.