Health care is conventionally considered a crucial determinant in promoting the general physical and psychological health and well-being of people worldwide. An example of this was the worldwide eradication of smallpox in 1980, stated by the WHO as the very first disease in human history to be completely eliminated by deliberate healthcare interventions.The delivery of modern-day healthcare depends on groups of trained specialists and paraprofessionals coming together as interdisciplinary groups. This includes professionals in medicine, psychology, physiotherapy, nursing, dentistry, midwifery and allied health, together with numerous others such as public health specialists, community health employees and assistive workers, who systematically offer individual and population-based preventive, alleviative and corrective care services.