What is the simple definition of a covenant controlled community?

What is the simple answer to a covenant; such as in a covenant controlled community.What is the simple definition of a covenant controlled community?
The covenant contains community guidelines that all community members must follow. Ever heard of a homeowner's association, or a condo association? That's a covenant controlled community.What is the simple definition of a covenant controlled community?
Think of the movie ';the Stepford Wives';.