Data Pool is notheing but a parameterization.Here we can access the single output for different input values, which already defined in the code.

Example, we want login the application with different user names, as this type of situation you have we use data pool .

Datapools provide variable data to your tests during execution.

Performance tests are based on user emulation. During a session with the application-under-test, the tester actually uses a feature that real customers will use, and from the recorded session a test is generated containing the exact data that the tester entered. For example, to create a performance test for a dialog in a web-based shopping application that prompts a shopper for an account number, the tester actually engages the dialog by selecting an item that is offered for sale, clicking a "pay now" button, and entering an account number. During playback of the test, in which the tester might request that hundreds of instances of the transaction be run simultaneously, it is desirable that different account numbers (perhaps a combination of valid and invalid numbers) are used for each of the instances. To supply variable data for tests to use during playback, the tester creates datapools.

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