Incident Management is like implementing a small the fire brigade in your team. When a fire breaks out (an incident occurs), you need to be able to quickly identify where it's happening, alert the right people, and work together to put it out, and implement measures to make sure it doesn't happen again.
Once an incident is detected, the next step is to respond to it. For instance, you might create a runbook that outlines the steps to take when different types of incidents occur.
Incident Management is about being proactive in monitoring your software, having a plan for when things go wrong, working quickly to resolve issues and get things back to normal, and implementing measure to prevent the same issues from occuring again. It's like having a safety net for your application, ready to catch it when it falls.