Costs are reduced as the QA team shrinks due to the manual work replacement.
Overall testing time decreases as automated tests can be run quickly, anywhere and are conditionally free.
Automated tests eliminate possible human mistakes – automation does not ignore or overlook the things that a real person can.
Automated tests release tester's time, thus allowing to focus on testing extra functionality where manual tests are required.
Automation can increase productivity by reducing the time required to perform repetitive tasks.
Test automation, unlike manual testing, provides much greater test coverage when it comes to processing large data volumes.