Mobile optimization is crucial for SEO because it affects the user experience on mobile devices. With the majority of internet users accessing websites on their mobile devices, having a mobile-friendly website is essential. Google has also made mobile optimization a ranking factor, so websites that are not optimized for mobile devices may not rank well in search engine results pages (SERPs). Mobile optimization includes having a responsive design, fast loading times, and easy-to-read text and images on smaller screens. By optimizing for mobile devices, businesses can improve their SEO and provide a better user experience for their mobile visitors.