servant
US /ˈsɝː.vənt/
UK /ˈsɝː.vənt/

1.
a person who performs duties for others, especially a person employed in a house on domestic duties or as a personal attendant
:
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The wealthy family had many servants to manage their large estate.
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She worked as a domestic servant for years before starting her own business.
2.
a person or thing that serves or provides a service to others, often in a metaphorical sense
:
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He sees himself as a public servant, dedicated to the welfare of the community.
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Technology should be our servant, not our master.