Resolving software bugs is arguably the most important task of a software developer. Only by adequate software testing can developers find bugs in the system and fix these errors. However, with one fix often comes another bug, and the linear process becomes a cycle. It's possible that these seemingly new bugs weren't caught during the pre-release phase.
Research shows that a well-equipped software developer can catch 95 percent of known bugs prior to a code's release. The catch rate has remained somewhat stagnant over the past two decades despite advancements in software development. While a bug-free release is achievable, it has proven to be as rare as a blue moon.