Obsidian is a note taking program that can be used in a wide variety of ways depending on the workflow and preferences of the user. Most commonly, the system is used by free thinkers and researchers who use it as a Personal Knowledge Management (PKM) system, Many users eschew the traditional system of using folders in a hierarchy to nest information in very specific places for a search bar or tags based system or even the Graph View for navigation or MOCs. It has many plugins and themes for customizations so it can really become just about anything you need it to be.