Healthcare is traditionally related to as an essential factor in promoting the general physical and mental health and well-being of people around the world. An example of this was the worldwide elimination of smallpox in 1980, declared by the WHO as the first illness in human history to be totally eliminated by deliberate healthcare interventions.The delivery of contemporary healthcare depends upon groups of experienced professionals and paraprofessionals coming together as interdisciplinary teams. This includes specialists in medicine, psychology, physiotherapy, nursing, dentistry, midwifery and allied health, along with lots of others such as public health practitioners, neighborhood health employees and assistive workers, who systematically provide personal and population-based preventive, alleviative and corrective care services.