Obsidian (software)
Obsidian is a computer program where users can take notes and organize ideas. Users can write their notes in a kind of text file called Markdown. In one page, they can create links to another page in the software, and see how they are all connected like a map. It is designed for writers, teachers, students and people who work. Obsidian is free for personal use, but users have to pay if they want to use it for business.