Self-service (noun)

1. A system or facility where customers serve themselves.
2. A service in which the customer serves themselves without the assistance of a waiter, salesperson, or other employee.

Origin:

The term "self-service" is derived from the combination of two words "self" and "service" which means serving oneself.

Examples:

1. He was not used to self-service and felt uncomfortable.
2. The store now has a self-service checkout.
3. Self-service gas stations have become increasingly common.
4. The self-service buffet is a popular option for lunch.
5. Self-service is becoming more and more common in retail.