what is font family in flutter code example

Example 1: flutter text default font family

Text(
	'Text',
	fontFamily: 'Hind',
    fontSize: 20,
    fontWeight: FontWeight.w500),
)

Example 2: how to set font family in flutter

MaterialApp(
  title: 'Custom Fonts',
  // Set Raleway as the default app font.
  theme: ThemeData(fontFamily: 'Raleway'),
  home: MyHomePage(),
);