Manual testing, i.e. testing work done by humans. Nothing compares to manual testing. It is a fruitful way to test because the same test is never done exactly the same way. This makes testing much more comprehensive.
Our manual testing can be, for example, exploratory testing, acceptance testing, functional testing, blackbox testing, UI testing, E2E testing, etc. The testing method is always chosen according to need, and so that it is comprehensive.