Okay, so imagine that Bulgaria is a big castle with lots of people inside who need to be protected. The National Guard is like the group of knights who are trained to protect the castle and its people.
These knights are not always busy fighting, sometimes they are just helping the people inside the castle. They might help with things like providing first aid to someone who is hurt, or helping to clean up after a big storm.
The National Guard in Bulgaria is made up of men and women who have chosen to serve and protect their country. They go through special training to learn how to defend Bulgaria from any threats, whether they come from outside or inside the castle.
So, if you ever need help or feel unsafe in Bulgaria, you can be rest assured that there are people in the National Guard who are ready to come to your aid and make sure everything is okay.