| Subject | English | Welsh |
| comp., MS | Base Smart Card Cryptographic Service Provider | Darparwr Gwasanaeth Cryptograffeg Base Smart Card (The basic software module for by smart cards that performs cryptography and includes algorithms for authentication, encoding, and encryption) |
| comp., MS | Base Smart Card CSP | DGC Smart Card Sylfaen (The basic software module for by smart cards that performs cryptography and includes algorithms for authentication, encoding, and encryption) |
| comp., MS | Business Card | Cerdyn Busnes (A card-like layout on an Outlook Contact that provides the user with the look of a real world business card) |
| comp., MS | card reader | darllenydd cardiau (An input device used chiefly for identification purposes that reads information that has been magnetically encoded, usually in two tracks, on a plastic card, such as a credit card or an employee badge) |
| comp., MS | card validation code | cod dilysu cerdyn (A code that credit card companies use to authorize credit card charges. For example, American Express uses a four-digit number on the front of the credit card, and Visa, MasterCard, and Discover use a three-digit number on the back) |
| comp., MS | Card Verification Value | Gwerth Gwirio Cerdyn (A code that credit card companies use to authorize credit card charges. For example, American Express uses a four-digit number on the front of the credit card, and Visa, MasterCard, and Discover use a three-digit number on the back) |
| comp., MS | credit card | cerdyn credyd (A type of payment card where the supplier is paid by the card issuer. The card holder then pays the card issuer) |
| comp., MS | Electronic Business Card | Cerdyn Busnes Electronig (A card-like layout on an Outlook Contact that provides the user with the look of a real world business card) |
| comp., MS | prepaid card | cerdyn talu ymlaen llaw (A physical card that represents a specific value or amount of service for which the user has paid in advance) |
| comp., MS | SIM card | cerdyn SIM (A smart card that stores a subscriber's personal identifier, billing information, and data) |
| comp., MS | smart card | cerdyn clyfar (A plastic (credit card–sized or smaller) device with an embedded microprocessor and a small amount of storage that is used, with an access code, to enable certificate-based authentication. Smart cards securely store certificates, public and private keys, passwords, and other types of personal information) |
| comp., MS | sound card | cerdyn sain (A type of expansion board on PC-compatible computers that allows the playback and recording of sound, such as from a WAV or MIDI file or a music CD-ROM. Most PCs sold at retail include a sound card) |
| comp., MS | video card | cerdyn fideo (The electronic components that generate the video signal sent through a cable to a video display. The video adapter is usually located on the computer's main system board or on an expansion board, but it is sometimes built into the terminal) |
| comp., MS | Virtual Smart Card | Smart Card Rhithwir (The ability for some devices to act like physical smart cards even if they aren't) |