How a search campaign works
A search campaign shows text ads on Google’s results pages in response to what someone typed. You supply keywords, which are not the exact words that trigger an ad but instructions about how closely a search must match before you are willing to bid. When a matching search happens an auction runs, and your position and cost are settled by your bid together with Google’s judgement of your expected click-through rate, your ad’s relevance to the query, and the experience of the page you send people to.
Inside the campaign sit ad groups, each holding a small set of related keywords and the ads written for them. The campaign itself carries the budget, the bidding strategy, the locations, the languages and the schedule. Ads are normally responsive: you supply several headlines and descriptions and Google assembles combinations for each auction.
Why search campaigns matter
Search is the only advertising channel where the customer starts the conversation. Somebody typing “emergency plumber Kathmandu” has a problem right now, and an ad that answers it is welcome in a way an interruption in a social feed is not. That is why search usually converts better than channels that find people rather than being found by them, and why it is normally the first paid channel I would put a limited budget into.
It is also the most controllable. You can see the actual searches you paid for, exclude the ones you never wanted, and decide what a click on each is worth to you. Very little else in paid media offers that combination of visibility and control.
Common mistakes with search campaigns
Broad targeting with no negatives is the expensive one. Left alone, broad match will find searches that share a topic with your keyword but not an intent — people researching, people looking for jobs, people hunting for a free version of what you sell. The search terms report shows exactly which, and it goes unread more often than any other screen in the platform. A negative keyword list is what turns that report into savings.
The second mistake is sending every ad to the homepage. A search campaign’s whole promise is specificity, and a homepage answers a general question. The third is running search with no conversion tracking, which leaves you optimising towards clicks — something the platform is extremely good at delivering and which no business banks.
How to act on it
Set up conversion tracking before the first ad runs, then start narrow: a small set of keywords you are confident about, tight match types, a negative list, and a landing page that repeats the search back to the visitor. Widen only once the narrow version pays for itself.
Read the search terms report weekly in the early weeks and add negatives from it. Once there is enough conversion history, move to an automated bidding strategy and let budget follow the ad groups that produce leads rather than the ones that produce traffic. How a Google search ads campaign is structured at setup decides how much of this work you are left doing later.