Mental health can be defined as the  level of psychological well-being, or an absence of mental illness
Do you know of someone who suffers from a mental illness?
No but I have good knowledge about the subject, for someone to be mentally stable he has to function at a satisfactory level of emotional and behavioural adjustment
It must be hard on people who have a mental illness just to make it through the day.  It must be exhausting.
Yes it is. WHO says that mental health includes subjective well-being, perceived self-efficacy, autonomy, competence, inter-generational dependence amongst others
I've heard that as many as one in five people in America suffer from a mental health illness.  Do you think that other countries are the same?
1999), mental health is the successful performance of mental function, resulting in productive activities, fulfilling relationships with other people, and providing the ability to adapt to change and cope with adversity. The term mental illness refers collectively to all diagnosable mental disorders—health conditions characterized by alterations in thinking, mood, or behavior associated with distress or impaired functioning. Mental health and mental illness are two continuous concepts. People with optimal mental health can also have mental illness, and people who have no mental illness can also have poor
Mental health
Mental health is the level of psychological well-being or an absence of mental illness. It is the state of someone who is "functioning at a satisfactory level of emotional and behavioural adjustment". From the perspectives of positive psychology or of holism, mental health may include an individual's ability to enjoy life, and to create a balance between life activities and efforts to achieve psychological resilience.
According to the World Health Organization (WHO), mental health includes "subjective well-being, perceived self