The knowledge economy is a term that refers either to an economy of knowledge focused on the production and management of knowledge in the frame of economic constraints, or to a knowledge-based economy. In the second meaning, more frequently used, it refers to the use of knowledge technologies (such as knowledge engineering and knowledge management) to produce economic benefits as well as job creation. The phrase was popularized by Peter Drucker as the title of Chapter 12 in his book The Age of Discontinuity, And, with a footnote in the text, Drucker attributes the phrase to economist Fritz Machlup and its origins to the idea of "scientific management" developed by Frederick Winslow Taylor.

The essential difference is that in a knowledge economy, knowledge is a product, while in a knowledge-based economy, knowledge is a tool. This difference is not yet well distinguished in the subject matter literature. They both are strongly interdisciplinary, involving economists, computer scientists, engineers, mathematicians, librarians, geographers, chemists and physicists, as well as cognitivists, psychologists and sociologists.