What is Data Driven Testing ?

Data driven testing is the testing technique in which we will test the same functionality with the different set of data.

For Example
Suppose we are testing the login functionality.

In login functionality we have two textbox such as userName and password and a login button.

Now we will test this functionality with the different different userName and the Password.Which means the login functionality is the same but the credentials are different. Hence testing the same functionality with the different set of data is data driven testing