SEO is crucial in web development as it ensures websites are discoverable by search engines, improving visibility and traffic. Effective SEO practices, including responsive design, fast loading times, and keyword optimization, enhance user experience and website ranking. Integrating SEO from the development phase helps in structuring content and coding practices that are search engine friendly, leading to better online presence and potentially higher conversion rates. Therefore, incorporating SEO strategies is essential for any website looking to achieve and maintain a competitive edge in the digital marketplace.