Can you name the types of non-relational relationships between data in databases?

In non-relational databases, relationships between data can be of the following types:

• Embedded documents — data is stored inside other documents, for example, in MongoDB.
• References — one document contains the identifier of another, allowing relationships without a strict schema.
• Key-Value — data is stored as key-value pairs, and relationships can be implemented through keys.
• Graph relationships — in graph databases, relationships are represented by edges between nodes.

Unlike relational databases, where relationships are implemented through foreign keys and join tables, non-relational databases offer more flexible relationships that can be realized through nesting or references.