Fine tuning is a process of making small adjustments to a system or product in order to improve its performance. It is often used in the context of audio and video equipment, but can also be applied to other areas such as software development. The term 'fine tuning' comes from the idea of making small, precise changes to a system in order to achieve the desired result. The crossword solution for the term 'fine tuning' is 'CHANGE, ' which accurately describes the process of fine tuning.