This report provides an overview of Search Engine Optimization (SEO) marketing, defining the concept and its importance in enhancing website visibility and attracting customers. It highlights the advantages of a successful SEO strategy, including improved competitive positioning, cost-effective marketing, value for consumers, and a promising return on investment. The report also discusses factors crucial for website SEO success, such as focusing on the target audience, growing organic traffic, and capitalizing on existing traffic. Furthermore, it analyzes the role of SEO in 2019, particularly in understanding mobile customer behavior. The report includes case studies of companies like Desigual and Zalando, offering insights into the practical application of SEO strategies and their impact on business outcomes. References from academic sources are provided to support the analysis.