CSS – short for Cascading Style Sheet. CSS plays a vital role in digital marketing, particularly in SEO (Search Engine Optimization) and PPC (Pay-Per-Click) advertising. By enabling the creation of well-structured, visually appealing, and responsive websites, CSS enhances user experience, which is a key factor in SEO rankings. Additionally, effective use of CSS can improve website load times and mobile-friendliness, both of which are important for SEO and can positively influence PPC ad quality scores, leading to better ad placements and potentially lower costs.