A physical disability is one in which a person is unable to function normally because they are missing or have very little of their body.
A sensory disability describes the kind of people who have difficulty communicating or using language and who have lost their ability to see or hear.
Intellectual disability refers to a condition that restricts a person's ability to deal with a variety of life situations and daily tasks.
A mental illness is one that has a direct impact on a person's behavior. When a person exhibits mental disorders in their adaptive behavior, they are considered to have a mental disability.