git-bisect uses a binary search algorithm to find which commit in your project’s history introduced a bug. You use it by first telling it a "bad" commit that is known to contain the bug and a "good" commit that is known to be before the bug was introduced. Then git bisect picks a commit between those two points and asks you whether the selected commit is "good" or "bad". It continues narrowing down the range until it finds the exact commit that introduced the change.
