Depression can be an extremely debilitating mental disorder, which can impair an individual's life significantly. Depression is an "affective disorder" i.e. a mood disorder, which may seem harmless,  but in severe cases can endanger the individual as well as others. Individual's may not recognise that they have a problem, or in fact that they are  unwell. However this is where healthcare professionals may intervene, after fully understanding the essence  of depression.