SEM is an acronym for Search Engine Marketing, which is a broad term for the internet marketing that companies and websites do with regards to the search engines. SEM includes Pay-Per-Click (PPC) and paid ways to get a site onto the search engine results page (SERP) for its important keywords as well as SEO (search engine optimization) to improve organic search results. Below is a list of the top sites relating to SEM, including both SEM companies and information sources. If you think that a site is missing please "add a site to the list" at the bottom left.
Related Lists:
Search Engine Optimization (SEO) - Information and Companies
SEO: Boosting web presence
PPC - Pay Per Click