Fundamentals
SEM (Search Engine Marketing)
Search engine marketing is the broad practice of gaining visibility on search engines through both paid ads and organic optimisation.
In common usage it often refers specifically to the paid side, such as Google Ads, while SEO covers the unpaid side. A business bidding on "hotel booking Bangkok" while also optimising its content for that term is running SEM across both channels. The two work best in tandem, with paid covering immediate demand and SEO building long-term equity.
Budget split between the two channels is usually argued about with no data behind it. A more useful method is to look at where each keyword sits today. Terms you already rank in the top three for rarely need paid support, and bidding on them mostly buys clicks you would have received anyway. Terms sitting on page two are the strongest paid candidates, because demand is proven and organic is close enough that the spend has an end date. Brand terms sit apart from this logic entirely: defending them is cheap insurance against competitors bidding on your name, not a growth lever.
Example
A hotel bids on "bangkok riverside hotel" at 25 baht a click while its SEO team builds the page targeting the same phrase. Month one, paid delivers all 90 bookings from that term. By month eight the page ranks 2nd organically, paid is throttled back to top-of-page defence, and the blended cost per booking drops by half.
Frequently asked questions
- Is SEM the same thing as PPC?
- Not quite. SEM covers all search visibility, paid and organic, though in everyday usage most people say SEM when they mean the paid side. PPC is specifically the pay-per-click buying model. If someone offers you SEM, ask exactly which channels are included before you sign.
- Should I run SEO and paid search at the same time?
- Usually yes. Paid search buys immediate visibility while SEO compounds, and the two share data: search terms from ads reveal what to write about, and organic winners tell you where to stop paying. The mix should shift over time as organic starts covering terms you currently rent.
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