The development of cooling technology has been a vital prerequisite for the rapid, if not explosive advancement of modern computers. This has been especially true during the past 15 years with the advent of integrated circuit chips and their application in multi-chip module packages for high-performance applications. Today, cooling is viewed as a gating technology for the development of future computers. This paper provides a review of the development of cooling technology used in computer systems, covering air, air-liquid hybrid, and water cooling. Various designs and approaches used to enhance each cooling technology will be discussed. Development of liquid immersion technology will also be discussed with examples of electronic cooling applications.