Search engine marketing (SEM)
Also known as: SEM
In short
Marketing that increases a business’s visibility in search results, commonly used to describe paid search campaigns.
Search engine marketing, usually shortened to SEM, concerns visibility in search results. In everyday advertising work, the term commonly refers to paid search. Some uses include both paid advertising and organic search work, so agree on the scope before comparing plans or reports.
SEM and SEO have different mechanisms
Paid search uses an advertising system, campaign settings, and an auction to compete for placements. Search engine optimization works on a site’s organic discoverability. Paying for an advertisement does not buy a higher organic ranking.
A paid search plan connects the searches a business wants to reach with relevant creative and destinations. It also defines the budget and the outcome to measure, such as a sale or qualified inquiry.
SEM is therefore a planning term, not a single campaign setting or a guarantee of appearing first.
Illustrative example
An online parts store gives its agency an SEM brief covering paid search for selected product categories. A separate SEO workstream improves product information and site structure. Both support discovery, but their spending and results are reported separately.
The example makes the terminology explicit. Without that agreement, an SEM report may mix organic visits, paid clicks, and different cost bases. Label the channels and measurement method before drawing conclusions about which activity performed better.