The key difference between SEM and SEO is SEM focuses on paid ads to drive traffic, while SEO involves optimizing a website to increase organic search traffic. En el mundo del SEO podemos distinguir diferentes "escuelas", luego que hay muchas técnicas posibles para mejorar el posicionamiento de una web. https://directmysocial.com/story2237220/un-imparcial-vista-de-search-engine-marketing