Can you explain the difference between SQL and NoSQL database management systems?

SQL (Structured Query Language) is a query language for relational databases that store data in tables with a clearly defined schema. Such databases ensure transactional integrity, support complex queries, and maintain strict data consistency. Examples: MySQL, PostgreSQL, SQLite.

NoSQL is a general term for non-relational databases that can store data in various formats: documents, key-value, graphs, columns. They are more flexible in structure, scale well, and are suitable for large volumes of data with less strict schema requirements. Examples: MongoDB, Redis, Cassandra.

In brief:

• SQL: fixed schema, tables, complex queries, ACID
• NoSQL: flexible schema, various data models, scalability, eventual consistency

The choice depends on the project requirements and the nature of the data.