SQL and NoSQL are two different types of database systems. The main differences between SQL and NoSQL are:

• 1. Data Model: SQL databases use a relational data model, which means that data is organized into tables with defined relationships between them. NoSQL databases use a non-relational or document-based data model, where data is stored in documents or collections that can have varying structures and are not necessarily related to each other.
• 2. Scalability: SQL databases typically have limited scalability due to the constraints of their relational data model. NoSQL databases are designed to be highly scalable and can handle large amounts of unstructured data.
• 3. Schema flexibility: SQL databases have a predefined schema that needs to be defined before any data can be added. NoSQL databases offer more flexibility and do not require a predefined schema. This makes them more suitable for use cases where data is constantly changing or evolving.
• 4. Querying: SQL databases use structured query language (SQL) to query the data. NoSQL databases have their own query language, which varies by database type.
• 5. ACID compliance: SQL databases typically provide ACID (Atomicity, Consistency, Isolation, and Durability) compliance, which ensures that transactions are processed reliably. NoSQL databases typically sacrifice some of these guarantees in favor of scalability and performance.