Graph

A graph is a data structure composed of connected (and disconnected) nodes.

A familiar example is that of a social network. Each account can be thought of as a node and the "follow" and "follower" relationships can be thought of as edges (connections). A node may have many or few connections, and the nodes it is connected to are meaningful to understand how it fits into the whole.

en uses this concept to create a writing tool, allowing you to map out complex thoughts as a web of connected texts.