Knowledge Graph Fundamentals

Relationships contain two nodes
Example
- (PERSON)-[KNOWS]-(PERSON)
The nodes are "in" a relationship, which itself has properties.
In OO-perspective or even relational model, the entity would "know" each other with direct references or foreign keys.
Graph types are composable!
Formally
- Nodes have labels which is used for grouping.
- Nodes are data record with key/value properties.
- Relationships are also data records which have a direction, a type, and properties.
  - Type: KNOWS, TEACHES, INTRODUCES
  - Property: Mentioned below the Type for each relationship.

What is a Knowledge Graph?

Knowledge Graph: A database that stores information in nodes and relationships.
Both nodes and relationships can have properties.
Nodes can be given labels to group them together.
Relationships always have a type and a direction.