Optimising

 Optimizing is the art of getting a file to be the best it can be without being too large of a file size, an example of this is with a photograph, in its original format it is of high quality and high file size. Optimizing this would mean decreasing the quality to decrease the file size. A picture with the aspect ratio of 2:6:1 will have both high quality and high file size due to a higher resolution. When optimized this may decrease to something such as 23:1 which still has moderately good quality but with a much reduced file size.