| Subject | English | Welsh |
| comp., MS | computer administrator | gweinyddwr cyfrifiadur (The person in charge of managing a Windows computer. The administrator is responsible for installing software, assigning passwords, and managing files) |
| comp., MS | computer build report | adroddiad adeiladwaith y cyfrifiadur (A report generated by OEMs for each OA 3.0 manufactured computer which is then sent to Microsoft for processing. This report includes the hardware hash value and Product Key ID) |
| comp., MS | computer language | iaith cyfrifiadur (An artificial language that specifies instructions to be executed on a computer. The term covers a wide spectrum, from binary-coded machine language to high-level languages) |
| comp., MS | computer program | rhaglen gyfrifiadurol (A set of instructions in some computer language intended to be executed on a computer so as to perform some task. The term usually implies a self-contained entity, as opposed to a routine or a library) |
| comp., MS | computer security | diogelwch cyfrifiadur (The protection of information assets through the use of technology, processes, and training) |
| comp., MS | computer-to-computer network | rhwydwaith cyfrifiadur-i-gyfrifiadur (A temporary network used for sharing files or an Internet connection. In an ad hoc network, computers and devices are connected directly to each other instead of to a hub or router) |
| comp., MS | username (The name by which a user is identified to a computer system or network. During the logon process, the user must enter the username and the correct password. If the system or network is connected to the Internet, the username generally corresponds to the leftmost part of the user's e-mail address (the portion preceding the | enw defnyddiwr |