Websites are the cornerstone of digital marketing, the online premises of brands and companies, therefore, this chapter focuses on them. Making web design decisions stretches far beyond personal aesthetics, and there is compelling evidence that customers respond and evaluate the overall online experience differently even when a slight detail is changed. This chapter reviews the school of thoughts and models that apply to strategic website design, from the marketer's point of view. Later, we present the main concepts on Search Engine Optimization, since it is significant to website success and tightly bonded to the website architecture. The chapter concludes with a glance at fundamental metrics, as an effort to explain and decode how website related decisions are quantified, measured, evaluated and related to marketing objectives.