Obsidian is a note-taking and knowledge-management app that allows you to create and store your notes locally in the Markdown file format. It is a private and flexible app that adapts to the way you think, and it provides a unique way of organizing information based on the Zettelkasten concept. Some key features of Obsidian include:

• Internal Links: You can link notes together and create a knowledge graph of information.

• Cross-Platform: Obsidian is available for Mac, Windows, and Linux, as well as mobile operating systems such as Android and iOS.

• Customizable: Obsidian can be customized by adding plugins, which enable users to extend the softwares functionality with additional features.

• Distraction-Free: Obsidian provides an elegant, distraction-free page for note-taking.

Obsidian is a free app that can be downloaded from the official website. It has been praised for its ability to help users organize their notes and generate new ideas from concepts.