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Grails is an open-source web application framework that offers a high-productivity environment. The framework integrates with the Groovy programming language and the Java Virtual Machine (JVM), providing developers with familiar tools and libraries from the Java ecosystem. Grails applies principles like convention over configuration, Don’t Repeat Yourself (DRY), and seamless integration of third-party plugins to reduce development time and increase maintainability. It uses GORM (Grails Object-Relational Mapping) for database access, which simplifies data management by providing an API for creating queries without having to write SQL statements explicitly. Grails also incorporates a tag library similar to JSP's custom tags for building user interfaces in a consistent manner across its applications.