Each set is randomly generated to simulate real data.
Test data is actually the input given to a software program. It represents data that affects or is affected by the execution of the specific module. Some data may be used for positive testing, typically to verify that a given set of input to a given function produces an expected result. Other data may be used for negative testing to test the ability of the program to handle unusual, extreme, exceptional, or unexpected input. Poorly designed testing data may not test all possible test scenarios which will hamper the quality of the software.
Testing is an iterative part of the development process that it performed to ensure the quality of the code. During the development process you will need fake data similar to real data for testing purposes.
You can generate random data for your different projects, you can generate Credit Cards, Identities, Names, Passwords, Location, Payment, Email Address, Internet data and more!