Diapers are a product of hygiene used by babies, children and adults who do not have (or lost) control of their physiological needs and if they do not use them, may get dirty with their urine or feces.
In the past, diapers were cloth and today have technological resources like absorbent gels, such as sanitary pads.
The adult who due to illness (urinary incontinence, etc..) Loses control of their physiological functions, has to wear a diaper commonly called Geriatric
Diaper (because seniors are generally those who use this type of diaper)
or Incontinent Pads