Quality is delighting customers
Manual Testing(MT) means Testing will be done with human resources (HR).
Some disadvantages r below
In MT more HR r required , lack of time , repeating the same test with multiple data is impossible , simultanous actions impossible
Automation Testing (AT)means testing can be using some tool like QTP, selenium , silk test , etc.,
in AT , Automation Tool works as an Assistant to the tester .
The disadvantages of MT will be Solved/overcome in AT