Is incident response really important?

There are so many processes in detecting an error an in security things but I want to know that is incident response really very important?

[donaldd]

Incident response is an organized approach to addressing and managing the aftermath of a security breach or cyberattack, also known as an IT incident, computer incident, or security incident. The goal is to handle the situation in a way that limits damage and reduces recovery time and costs. And now a days NIST incident response process became very important for all kind of organization because it protects us from so many kind of problems and errors.