This document discusses medical ethics and its principles. It begins by defining ethics and medical ethics, noting that medical ethics deals with moral issues in medical practice. It then outlines four basic principles of medical ethics: respect for patient autonomy, non-maleficence, beneficence, and justice. The document also discusses public health ethics, research ethics, and some top ethical issues in healthcare such as balancing care quality and access. It emphasizes that quality care is built upon ethical standards and principles.