Abuse is not normal and never ok. Being abused means a person is being deliberately hurt by someone else.
It can vary from the seemingly trivial act of not treating someone with dignity and respect - to extreme punishment, cruelty or torture.
The commonly recognised forms of abuse are Physical, Sexual, Financial, Psychological, Discriminatory, Neglect or acts of omission, Organisational, Self Neglect, Domestic Abuse and Modern Slavery.
:: more on types of abuse