There are some major differences between manual testing and automation testing. In manual testing, a human performs the tests step by step, without test scripts. In automated testing, tests are executed automatically via test automation frameworks, along with other tools and software.

The biggest difference between manual and automation testing is who executes the test case. In manual testing, the human tester does it. In automation testing, the tool does it.

Users choose automated testing over manual testing mainly because of time. In fact, automated testing was developed because manual testing is so time-consuming. Automated testing is much faster.

Manual testing is very time-consuming. As software engineering demands have grown, automated testing became a necessity to keep up with the pressure and go-to-market needs.