Forcefields define the interactions between particles in molecular simulation and ultimately determine the quality of any simulation. A diverse array of forcefields have been developed since the 1950s with the general trend being that forcefields have increased in complexity and computational intensity. Over the past 70 years, forcefield technologies have been instrumental in addressing scientific and engineering problems over ever increasing time and length scales. Trends in microprocessor development have directly shaped the evolution and application of forcefield technologies. Despite the introduction of increasingly sophisticated forcefields, forcefields present since the advent of “fast computing machines” have remained relevant in modern research. This webinar provides a glimpse into the infancy of forcefield technologies, touches upon current capabilities, and discusses the future of molecular simulation.