Welcome to Mainstreethost. Since 1999, we have been mastering the art of search engine optimization (SEO) and digital marketing strategy. 888-874-3791 The phrases SEO (search engine optimization) and SEM (search engine marketing) are similar and sometimes used interchangeably, but SEO and SEM are different services. Search Engine Optimization is just one of the many services we provide. We are a digital marketing firm with experience in SEM, SMM, & ORM…