This document introduces the concept of open data and how it relates to governance and participation. It defines open data as data that is publicly available, machine-readable, and free to use and reuse. Examples are provided of how open data is used in areas like monitoring global warming, international aid, and development goals. The document argues that open data can increase transparency, enable innovation, support civic engagement, and facilitate collaboration. However, it notes that open data is still an emerging concept and only the beginning of understanding its potential impacts.