What is GIT Bisect and what is its purpose?

The GIT Bisect command is used to find the commit that has introduced a bug by using binary search.

Purpose of GIT Bisect command

The command uses a binary search algorithm to find which commit in the project’s history has introduced a bug.
Before the bug is introduced into the commit, the commit is referred as “good”; after the introduction of the bug, it is referred as “bad”.

Then the command used picks a commit between those endpoints and asks what kind of commit is it. The process continues till it finds the exact commit that introduced the change.