Your website SEO does not only relate to search engines but to your page SEO, keywords and headings.
Images are very important for your website, so they need to be SEO optimised too. From titles to alt titles and meta descriptions.
Why do you need SEO?
Building a strong site architecture and providing clear navigation will help search engines index your site quickly and easily. This will also, more importantly, provide visitors with a good experience of using your site and encourage repeat visits. It’s worth considering that Google is increasingly paying attention to user experience.
When it comes to how much traffic is driven by search engines to your website, the percentage is substantial, and perhaps the clearest indicator of the importance of SEO.