Infrastructure security is like having a secret fort. Just like how we have walls and gates to keep our house safe from strangers, companies and government organizations have big computer systems with lots of information that need to be kept safe too.
These computer systems are like a secret fort which have different parts that are important such as server rooms, networks, and software. If somebody bad were to get into these systems, they could steal information or break things that are important to the people who use them.
So, we have to protect our fort! People who work in infrastructure security work really hard to make sure that nobody who is not supposed to be in the fort gets in. They use special programs and tools to figure out if someone is trying to get in and stop them before anything bad happens.
It's like having a superhero team that keeps the fort safe! They make sure all the walls and gates are strong and can't be broken down by anyone who shouldn't be there. The superhero team is really good at their job, and they work really hard to make sure that nobody gets in and steals or breaks anything important.