| Abbreviation | Definition |
|---|---|
| SDD | Standard Detail Drawings |
| SDF | Standard Download File |
| SDL | Simple DirectMedia Layer |
| SDLC | Synchronous Data Link Control |
| SDMI | Secure Digital Music Initiative |
| SDN | Send Data Now |
| SDNP | Sustainable Development Networking Programme |
| SDP | Session Description Protocol |
| SDP | Shelf Discovery Protocol |
| SDR | Session Directory Protocol |
| SDR | Single Data Rate |
| SDSC | San Diego Supercomputer Center |
| SDSL | Symmetric Digital Subscriber Line |
| SE | Server Environment |
| SEA | Self Extracting Archive |
| SEADS | South Eastern Developmental Specialty Services |
| SEAM | Scalable and Efficient ATM Multicast |
| SEAS | South East Asia Server |
| SEF | Simplified Edi Format |
| SEMS | Secure Electronic Messaging System |