Sequelize is an Object-Relational Mapping (ORM) library for Node.js and TypeScript that provides a programmatic interface to interact with multiple SQL databases including PostgreSQL, MySQL, MariaDB, SQLite, SQL Server, Snowflake, Oracle, and DB2. Developers use Sequelize to write database queries and manage data models in JavaScript/TypeScript rather than writing raw SQL, which reduces boilerplate code and helps prevent common security issues like SQL injection. It supports advanced features like transactions, JSON data types, and works with both modern async/await patterns and callbacks.

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