Okay kiddo, so you know what a police officer is right? Well, a special corps of gendarmes is kind of like that, but in France they have a special group of police with specific, important jobs.
This group is called the gendarmerie, and they work in both urban and rural areas to keep people safe. They are very well trained and have lots of special tools and equipment to help them do their job right.
They wear a special uniform that makes them easy to recognize and their cars and motorcycles have special markings on them too.
The gendarmerie help with things like controlling crowds, solving crimes, preventing accidents and disasters, and helping people who are lost or hurt. They also protect important people like politicians and diplomats.
So, in short, the special corps of gendarmes are a group of highly trained police officers in France who protect and serve the community in various different ways.