Save Time /Speed: Due to advanced computing facilities, automation test tools prevail in speed of processing the tests. Automation saves time as software can execute test cases faster than human.
Reduces the tester’s involvement in executing tests: It relieves the testers to do some other work.
Repeatability/Consistency: The same tests can be re-run in exactly the same manner eliminating the risk of human errors such as testers forgetting their exact actions, intentionally omitting steps from the test scripts, missing out steps from the test script, all of which can result in either defects not being identified or the reporting of invalid bugs (which can again, be time consuming for both developers and testers to reproduce)
Simulated Testing: Automated tools can create many concurrent virtual users/data and effectively test the project in the test environment before releasing the product.
Test case design: Automated tools can be used to design test cases also through automation, better coverage can be guaranteed than if done manually.
Reusable: The automated tests can be reused on different versions of the software, even if the interface changes.
Avoids human mistakes: Manually executing the test cases may incorporate errors. But this can be avoided in automation testing.
Internal Testing: Testing may require testing for memory leakage or checking the coverage of testing. Automation can done this easily.
Cost Reduction: If testing time increases cost of the software also increases. Due to testing tools time and therefore cost is reduced.