Computing
- Simple Declarative Language, a simple universal language for describing typed data in lists, maps and trees
- Specification and Description Language, an ITU-specified system description language
- Security Development Lifecycle, a software development process by Microsoft
- Simple DirectMedia Layer, a cross-platform, free and open source multimedia library
- Services Description Language, a specification language developed at Microsoft as a successor of CORBA's IDL; a fore-runner to Web Services Description Language
- Structure Definition Language, a data definition language for OpenVMS
- Scene Description Language, the language used by POV-Ray
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