Search engines play an important role in how consumers discover brands, products and services online. For a digital platform such as Duolingo, being visible when consumers search for ways to learn a new language can help attract potential users. This is where Search Engine Optimisation (SEO) becomes important. SEO refers to improving a website's visibility and ranking within organic, or non-paid, search results. A strong SEO strategy can generate quality website traffic, build credibility and provide long-term reach for a brand. Duolingo provides a useful example because its service closely matches common search intentions relating to language learning. Someone wanting to learn Spanish, for example, might search terms such as "learn Spanish online", "Spanish lessons" or "learn Spanish for free". This creates an opportunity for Duolingo to use relevant keywords and content to appear when consumers are actively looking for a solution. Keyword research is an important part of SEO because it allows marketers to understand what consumers are searching for and develop content around this search intent. However, effective SEO is no longer about repeating keywords as frequently as possible. Instead, keywords should be incorporated naturally into relevant, high-quality content, including titles, descriptions and website copy.

Duolingo can create customer value through this approach by connecting users with relevant language-learning content at the moment they need it. SEO can generally be divided into on-page, off-page and technical SEO. On-page SEO includes elements within a website such as content, keywords, internal links, images and metadata. Off-page SEO focuses on factors outside the website that increase its authority, including backlinks, social promotion and brand mentions, while technical SEO considers factors such as website speed, structure and indexation. These areas are particularly relevant to Duolingo because attracting a user through search is only valuable if the website provides a positive experience once they arrive. However, Duolingo cannot rely entirely on SEO. Search rankings are competitive and constantly changing, meaning the company must continually monitor and improve its content. Search is also evolving through artificial intelligence, with Generative Engine Optimisation (GEO) focusing on increasing visibility within AI-driven search platforms. The Week 8 material highlights clear structure, credible information and regularly updated content as important considerations for this emerging area. Overall, SEO provides Duolingo with an opportunity to reach consumers who already demonstrate an intention to learn. By matching relevant content to consumer search intent while maintaining a strong website experience, Duolingo can increase visibility, attract potential learners and ultimately convert searches into users.