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# Chapter 31. Edges

This chapter presents an overview of the edges. It describes what they are, how they can be connected to the components of a graph, how metadata can be assigned to them and propagated through them, how the edges can be debugged and how the data flowing through the edges can be seen.

## What Are the Edges?

The edge can be seen as a pipe conveying data from one component to another.

The following are properties of edges:

- Connecting Components with Edges

  Each edge must connect two components.

- Types of Edges

  Each edge is of one of the four types.

- Assigning Metadata to the Edges

  Metadata must be assigned to each edge, describing the data flowing through the edge.

- Colors of the Edges

  Each edge changes its color upon metadata assignment, edge selection, etc.

- Debugging the Edges

  Each edge can be debugged.

- Edge Memory Allocation

  Some edges are more memory-greedy than others. This section contains the explanation.

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