I need to know what is the difference between mental disability and mental disorder?

Disorder : when an illness causes impairment of functioning in one or more areas of one's life , that is called disability since the patient is disabled and unable to carry one or more functions. mental D/O on the other hand means mental disease such as depression, Anxiety, OCD.. etc.. so one can have a mental D/O without disability, if the disorder is severe enough, it may lead to mental disability. thanx

The difference: Intellectual Disability formerly called Mental Retardation is a state where an individuals level of functioning and intellegence is below his actual expected age. SIMPLY put verry low IQ. Most such people require some level of supervision for performing their ADLs. While mental illness affects your mood, thinking and behavior like Depression,anxeity, Schizophrenia and Addictions