A Zettelkasten is a system for thinking and writing
The Zettelkasten system is comprised of two pieces: a collection of notes in either physical or digital format, and the methodology of how to capture, distill, and connect these notes in order to leverage them to improve your thinking and writing.
“A zettelkasten is an object, a container comprised of at least one, but sometimes multiple compartments, each assigned a different note-type…. In addition to being an object, a zettelkasten is a methodology—a way to capture ideas in notes, establish relationships between them, and leverage both for knowledge work.” [1]