| Subject | English | Welsh |
| comp., MS | Multimedia Content Description Interface | Rhyngwyneb Disgrifiad Cynnwys Amlgyfrwng (A standard of video compression and file format developed by the Moving Pictures Experts Group for description and search of multimedia content data) |
| comp., MS | Web Part description file | ffeil disgrifio Rhan Gwe (An .xml file that defines the default property settings for a Web Part, including references to other files that are required to run and display the part) |
| comp., MS | Web Services Description Language | Iaith Disgrifio Gwasanaethau Gwe (" An XML format for describing Web services. WSDL allows Web service providers and users of such services to work together easily by enabling the separation of the description of the abstract functionality offered by a service from concrete details of a service description such as "how" and "where" that functionality is offered.") |