You may have noticed that in the previous image of a social graph, the edges have names. Indeed, some people are friends, while some others have a father/son relationship. Now, let's imagine we can have any kind of relationship, meaning we can start connecting different kinds of entities. For instance, a person is living in a particular country, so (s)he is connected to that country with a relationship of type LIVES_IN. Are you beginning to see the point? With that kind of reasoning, the world itself is a graph and your business is a subpart of it.
Graphs are about relationships, and the world is connected, meaning there are relationships everywhere. We’ll talk about this in more detail in Chapter 3, Empowering Your Business with Pure Cypher, which is dedicated to knowledge graphs.
Graph databases allow you to model the data in that way: nodes, connected by relationships of some type. Let's see how to migrate data stored in relational databases to graph databases.
