SEO (Search Engine Optimisation)
SEO depends on being able to read text in the site, so images and multi media are not so easy to engineer in response to the needs for Search engine searches.
There are always work arounds but in short, if you can’t read a word in the html of the website nor can Google.
In many cases SEO is not of crucial to having a web presence, but increasingly it can be a very lucrative way for clients and customers to find you.
There is always Add words to point people to your site but this can be expensive in the long term and uneccessary if you create your content with thought and planning.