ORM is a Node.js library that provides object-relational mapping for multiple databases including MySQL, PostgreSQL, SQLite, MongoDB, and Redshift. It allows developers to interact with databases using JavaScript objects instead of writing raw SQL queries, reducing boilerplate code and making database operations more intuitive. Developers use it when they need a straightforward way to define models, perform CRUD operations, and manage database relationships without dealing directly with database-specific syntax.

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