Hey there! SEO is essentially a component of the larger category, SEM.The main difference between these two terms is that search engine optimization is simply a component of search engine marketing. As mentioned above, SEM includes components of paid search, such as PPC and also SMM (Social Media Marketing) and
SEO company includes components like On-page techniques and Off-page techniques. It is important to note that never use the terms SEO and SEM interchangeably, because although they work hand in hand, they are not the same term.