Cafeteria
Cafeteria , noun
[Compare French cafetière.]
1.
A restaurant or café at which the patrons serve themselves with food kept at a counter, typically paying a cashier at the end of the counter and taking the food to tables to eat. [United States]
2.
a room within a building functioning in the same manner as a cafeteria{1}. In certain organizations, as schools, the food may be provided gratis.