# Graph - (Edge | Links | Arcs | Lines | Arrows) - Association

### Table of Contents

## 1 - About

An edge model a relationship between **two** node in a graph. Every edge model therefore a binary relationship (relationship between two elements) .

An Edge is also known as:

- Links
- Arcs
- Lines
- Arrows (only for directed graph)

A edge in a property graph always has:

- a direction, (that can be navigated regardless of direction)
- a type,
- two nodes (a start node and an end node if directed).
- quantitative properties (such as weights, costs, distances, ratings, time intervals, or strengths)

An existing edge will never point to a non-existing node.

A sequence of edges between two nodes is called a path

## 2 - Articles Related

## 3 - Property

### 3.1 - Direction

See Graph - Direction

## 4 - Representation

Edge can be represented in term of linear algebra vectors