Which type of database is specifically designed for storing relationships between people in a social network efficiently?

The type of database specifically designed for storing relationships between people in a social network efficiently is a Graph Database.

Here are the steps to answer this question:

1. Understand the question: The question is asking about a type of database that is specifically designed to store relationships between people in a social network in an efficient manner.

2. Identify the type of data: In a social network, data is stored in the form of entities (such as people, posts, comments) and the relationships between these entities (such as friendships, likes, comments). This type of data is best represented as a graph, where entities are nodes and relationships are edges.

3. Identify the suitable database: A Graph Database is a type of NoSQL database that uses graph theory to store, map and query relationships. It is specifically designed to hold data without restricting it to a pre-defined model. The data is stored in the form of nodes, edges, and properties.

4. Conclusion: Therefore, a Graph Database is the type of database that is specifically designed for storing relationships between people in a social network efficiently.