self-service
US /ˌselfˈsɝː.vɪs/
UK /ˌselfˈsɝː.vɪs/

1.
the practice of serving oneself, as in a store or restaurant, without the aid of a salesclerk or waiter
:
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The gas station offers self-service pumps.
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This restaurant is self-service, so you order at the counter.
1.
relating to or involving the practice of serving oneself
:
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We stayed at a self-service apartment.
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The supermarket has several self-service checkouts.