system software
US /ˈsɪstəm ˌsɔftwer/
UK /ˈsɪstəm ˌsɔftwer/

1.
software de sistema
software that provides a platform for other software to run on, including operating systems, device drivers, and utilities
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Windows is a common example of system software.
Windows é um exemplo comum de software de sistema.
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Updating your system software regularly is important for security.
Atualizar seu software de sistema regularmente é importante para a segurança.