Have you ever found a bug in code and needed to know when it was first introduced? Chances are, whoever committed the bug didn’t declare it in their Git commit message. In some cases, it might have been present for weeks, months, or even years, meaning you would need to search through hundreds or thousands of commits to find when the problem was introduced. This is the problem that git bisect was built to solve!

Source: LXer – Find bugs with the git bisect command