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A programming language dialect is a variation that offers different features or syntax from the original language. Dialects might be specialized for particular tasks, environments, hardware platforms, or communities of users. Examples include SQL (Structured Query Language) dialects like T-SQL for Microsoft SQL Server and PL/pgSQL for PostgreSQL's procedural language, as well as JavaScript dialects such as TypeScript. Dialects build upon existing languages while providing a level of abstraction that makes them more usable in specific scenarios without abandoning compatibility with the parent language's ecosystem.

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