1. DataProvider annotation
   1. Returns Java objects which are values to test method.
   2. Implement annotation by writing @DataProvider above method that has test data.
2. Purposes
   1. To pass an unlimited number of values to a test method. There is no restriction. The values can be any Java data type.
   2. To allow the test method to be invoked with different data sets. Each set will run & have its test results.
3. dataProviderClass Attribute
   1. Allows us to separate test method & data provider into different classes.
   2. An attribute of the @Test annotation just like the dataProvider.
4. dataProvider Attribute
   1. Connects @DataProvider annotation to test method
   2. @DataProvider's method name surrounded by double-quotes.