See the French definition of Critical Infrastructure.
Vital services (in Deutsch: Kritische Dienstleistungen) are important, sometimes essential goods and services for the population. An impairment of these vital services would cause significant shortage of supply, disruptions to public order, safety and security or other comparable dramatic consequences. 
UK refers to Essential Services as:
Services upon which daily life in the UK depends. The 9 sectors who offer essential services are: food, energy, water, communications, transport, health, emergency services, government, and finance.
See also the definition of Critical National Infrastructure
- ↑ Unpublished working glossary of UP KRITIS and BSI, 2014
- ↑ Cabinet Office, Section A: Introduction, Definitions and Principles of Infrastructure Resilience