The main difference between SEM (Search Engine Marketing) and SEO (Search Engine Optimization) is how they generate visibility on search engines. SEO focuses on improving a website’s ranking organically through techniques like keyword optimization, content creation, and link building to appear higher in search engine results pages (SERPs) without paying for ads. In contrast, SEM includes paid advertising like Google Ads, allowing businesses to pay for placement at the top of search results. While SEO builds long-term visibility, SEM provides immediate results by using paid strategies. Both can work together to grow your business’s online presence.