Indigenous knowledge is knowledge held and used by communities, peoples and nations that are ‘indigenous’.  In this sense, “indigenous knowledge” would be the traditional knowledge of indigenous peoples.  Indigenous knowledge is, therefore, a part of the traditional knowledge category, but traditional knowledge is not necessarily indigenous.  Yet the term is also used to refer to knowledge that is itself “indigenous”.  In this sense, the terms “traditional knowledge” and “indigenous knowledge” may be interchangeable.