What is this topic called Harm Reduction?

As a clinician it means doing all we can to prevent disease and once folks contract them we do all we can to reduce the suffering.
Rich

In what context? Googling it comes up with:

In social work: "Harm reduction refers to policies, programs and practices that aim to reduce the negative health, social and economic consequences that may ensue from the use of legal and illegal psychoactive drugs, without necessarily reducing drug use. Its cornerstones are public health, human rights and social justice."

In mental health: "Harm reduction is a conceptual framework and set of practices that focus on the minimization of the physical, social, and legal harms substance users do to themselves and to society as a whole."

In public health: "Harm reduction, or harm minimization, refers to a range of public health policies designed to lessen the negative social and/or physical consequences associated with various human behaviors, both legal and illegal."