A term you will mostly see in Europe
SEA is standard vocabulary in European agencies, where it sits next to SEO. American marketers rarely say SEA: they talk about paid search, PPC (pay per click) or SEM, which in the US usually means the paid side of search only. The practice is identical whatever the label: text ads triggered by keywords and sold through an auction.
How a Google Ads auction works
Every search triggers a separate auction for each ad slot. Google computes an Ad Rank for each eligible ad from six inputs: your max bid, the quality of the ad and landing page (summarized as Quality Score), minimum thresholds, auction competitiveness, search context such as location, device and time, and the expected impact of ad assets.
You rarely pay your max bid. Google charges the minimum needed to clear the thresholds and beat the advertiser just below you, so a more relevant ad can outrank a competitor with a higher bid and still pay less per click.
The levers of a search campaign
A search campaign is tuned on five settings, reviewed weekly during the first months:
- Keywords and match types (broad, phrase, exact) decide which searches can show your ad.
- Negative keywords block wasted searches such as "free", "jobs" or "DIY".
- Responsive search ads combine up to 15 headlines and 4 descriptions.
- Bidding: manual CPC, Maximize Conversions, Target CPA or Target ROAS.
- Location targeting and ad schedule.
Measuring whether paid search pays off
Three formulas cover most decisions: clicks = budget ÷ average CPC; CPA = cost ÷ conversions; ROAS = revenue ÷ ad spend. A campaign is profitable when CPA stays below the gross profit a customer brings, not just below the sale price.
Because paid search can be paused or scaled in minutes, it is the fastest way to test which keywords produce customers before investing months of SEO work in them.
