Is unit testing automated testing?
Automated unit testing is beneficial first and foremost because it is automatable (we usually only call something a “unit test” if it can be automated). Manually testing the entire application can take hours or even weeks as the size of the application expands. Even testing a small section of a programme takes effort and is prone to errors. You won’t be able to focus on executing each manual test perfectly unless you’re autistic, and you won’t be able to do it hundreds of times.