SEM encompasses any paid search ad campaigns – with Google
AdWords (for text ads) & Google Display Network (for display ads) being the primary outlets.
SEM is split up further into PPC (Pay-Per-Click) & CPM (Cost Per 1000 Impressions). As a general rule of thumb, PPC campaigns are goal-driven, like ‘ecommerce conversion’ or ‘enquiry form submission’, while CPM campaigns are branding driven. Depending on your objectives, and the number of products & services you offer, SEM campaigns vary in level of complexity. Keyword research and bid management are the key components dealt with.