This document provides information about Search Engine Marketing (SEM) strategies including Search Engine Optimization (SEO) and Search Engine Advertising (SEA). It discusses the advantages and disadvantages of each approach. It also provides two case studies, one on a SEM campaign for Coradirect.be that generated over 23,000 qualified visitors and 274 leads for a 1,093 Euro budget, and another on long-term SEO and SEA efforts for Ethias.be that increased their search engine traffic from 1-4% to 13-17% of total traffic.