What is the difference between NoSql and relational databases?

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There are several differences between NoSQL and relational databases:

1. Data Model: NoSQL databases are document-based, graph-based, or key-value pairs, whereas relational databases use tables to store data.

2. Scalability: NoSQL databases are designed to handle a large volume of data, and horizontal scaling can be easily achieved. On the other hand, relational databases are vertically scalable, which means they are limited by the hardware capacity of a single server.

3. Flexibility: NoSQL databases offer more flexibility in terms of data schema, and it can easily evolve over time. In contrast, relational databases have rigid schema requirements, and changes require significant effort to implement.

4. Querying: NoSQL databases offer several ways to query data, including full-text search, graph queries, and map-reduce. Relational databases use SQL to query data.

5. Data Consistency: Relational databases enforce ACID (Atomicity, Consistency, Isolation, Durability) compliance, which ensures data consistency. NoSQL databases, on the other hand, may or may not provide strong consistency, depending on the type of database and configuration.