So, artgemeinschaft is a fancy word that means "art community". Just like how you have friends you play with and share your toys with, artists have friends who they create art with and share their ideas with.
Artgemeinschaft started in Germany a long time ago, when some artists decided to form a special group together. They wanted to make art that was different from what everyone else was doing at the time. They wanted to make art that was more connected to nature and the world around them.
The group of artists chose a special name for themselves, which was "artgemeinschaft" because it sounds really cool and it means "art community". They would meet up and work on their art together, and they would even have special exhibitions to show off their artwork to other people.
Today, artgemeinschaft is used as a fancy word to describe any group of artists who work together and support each other's art. It's really important for artists to have friends who they can share their work with and get feedback from. Even grown-up artists need a community to belong to!