title: What does BuildContext do in Flutter?
body: <p>What does <code>BuildContext</code> do, and what information do we get out of it?</p>
  <p><a href="https://docs.flutter.dev/flutter/widgets/BuildContext-class.html" rel="noreferrer">https://docs.flutter.dev/flutter/widgets/BuildContext-class.html</a> is just not clear.</p>
  <p><a href="https://flutter.dev/widgets-intro/#basic-widgets" rel="noreferrer">https://flutter.dev/widgets-intro/#basic-widgets</a> on the 9th instance of the term <code>BuildContext</code> there is an example, but it's not clear how it is being used.  It's part of a much larger set of code that loses me, and so I am having a hard time understanding just what <code>BuildContext</code> is.</p>
  <p>Can someone explain this in simple/very basic terms?</p>