Image search optimization is the process of organizing the content of a webpage to increase relevance to a specific keyword on image search engines. Like search engine optimization, the aim is to achieve a higher organic search listing and thus increasing the volume of traffic from search engines.
Image search optimization techniques can be viewed as a subset of search engine optimization techniques that focuses on gaining high ranks on image search engine results.
Unlike normal SEO process, there is not much to do for ISO. Making high quality images accessible to search engines and providing some description about images is almost all that can be done for ISO.