| Subject | English | Galician |
| comp., MS | add-on | complemento (A device that is traditionally added to the base computer system to increase functionality, such as audio, networking, graphics, or SCSI controller) |
| comp., MS | add-on device | dispositivo complementario (A device that is traditionally added to the base computer system to increase functionality, such as audio, networking, graphics, or SCSI controller) |
| comp., MS | Mail Migration add-on | complemento Mail Migration (A tool that allows users to upload email messages, email folders, and contacts from an email account on their PC to the cloud to facilitate access from multiple devices) |