The HONcode is the oldest and most widely used ethical code concerning the quality and trustworthiness of medical and health related information available on the internet. It was created for evaluating medical and health websites and outlines eight ethical standards in the presentation of medical and health information online.

To become HONcode accredited and display the HONcode seal, there is an application process and an annual review. The aim of the HONcode is to protect the reader by ensuring that they know the source and purpose of medical and health information they read on the internet.