Google Images can be considered the second-largest search engine, with about 20% share contribution for most sites, and YouTube could be the third-largest search engine with about 3% share for most sites, according to
Tubics.com.
Visual search encompasses the content and optimization of images and videos with a focus on gaining visibility in the image and video thumbnails that show up in the rich results of the SERPs. Milestone Research finds that image thumbnails appear in 20-25% of results, with a similar proportion for video. That makes visual search an opportunity to gain visibility and traffic on almost 50% of searches.
With the advent of LLM-based search and it's multimodal answers, optimizing your images is a critical part of your generative engine optimization (GEO) strategy.