How do Google Ads work? A plain-English guide.
Senior Google Ads operator with 8+ years of experience, spent the last years almost entirely inside DTC eCommerce accounts. Small number of accounts, no juniors, no handoffs.
- You do not pay for showing up. You pay for clicks.
- The auction runs on Ad Rank, not on who bids highest.
- Quality Score can cut your cost per click substantially.
- Search, Shopping and Performance Max run different auctions, for different reasons.
Most explanations of how Google advertising works stop at one of two extremes. Either "it is an auction", which explains nothing, or a wall of platform jargon that assumes you already run accounts for a living.
This one walks through what happens in the seconds between somebody typing a search and an ad appearing on their screen. Who competes, what decides the winner, and why the price you pay is almost never the price you set.
No jargon left unexplained. Where a term matters, I define it in the same sentence.
The auction, in plain terms
Every single time somebody searches, every advertiser bidding on a matching term gets entered into an instant auction. Not a daily one, not a weekly one. That search, right then.
What decides the winner is not the biggest bid. It is Ad Rank, which is roughly your maximum cost per click multiplied by your Quality Score, plus a few smaller signals like the context of the search and the extras shown with your ad. So a smaller bid with a better score can beat a bigger bid with a worse one.
Then there is the part that surprises most business owners the first time they hear it. You do not pay your maximum bid. You pay roughly the minimum needed to beat the Ad Rank of the advertiser directly below you. Set your maximum at 2 EUR and the runner-up sits well behind you, and you might pay 0.90 EUR. Your maximum is a ceiling, not a price tag.
That is also the whole answer to how Google PPC works, PPC meaning pay per click. You are never charged for appearing. Only for the click.
Quality Score, the multiplier everyone underrates
Quality Score is Google's 1 to 10 rating of how good a match your ad is for the search. It has three main inputs: expected click-through rate (how likely people are to click your ad), ad relevance (how closely your ad text matches what was searched), and landing page experience (whether the page delivers on what the ad promised, and loads properly).
Here is what that does to the bill. Two advertisers, same search:
Those numbers are simplified, and Google's real formula carries more signals than this. The direction is real though: relevance is a discount. Sloppy accounts pay a premium for the same clicks, forever.
It is not one auction, it is several
People talk about Google Ads as one system. In practice you are dealing with different machines that happen to share a billing account.
Search ads are the text ads at the top of the results. Keyword-triggered, you write the copy yourself, and this is what most people mean when they ask how Google paid search works.
Shopping ads are the product tiles with an image and a price. No keywords, no ad copy. They are built from a product feed you upload, and the feed decides whether you enter the auction at all. The full breakdown is in the Google Shopping ads guide.
Performance Max is Google's automated campaign type. You hand over assets and a target, and it spends across Search, Shopping, YouTube, Display and Gmail without telling you the exact split. Powerful when it is fed clean data. Expensive when it is not.
If you learned this as AdWords, that is the same product. Google renamed AdWords to Google Ads in 2018, so "how does Google AdWords work" and "how does Google Ads work" are the same question.
Match types, briefly
A keyword is not a fixed instruction. Match type is how tightly a search has to resemble your keyword before your ad is allowed in the auction.
Broad match with no excluded keywords is the single most common way businesses pay for clicks that were never going to buy anything. If you check one thing this week, check that. The full explanation of how those exclusions work is in the negative keywords post.
- You know which match type each of your keywords is using
- Broad match keywords have negative keywords attached to them
- You've looked at the Search Terms report in the last 30 days
- You're not relying on broad match alone to control what triggers your ads
Where the money question gets answered
Winning the auction and getting the click is the start of the job, not the end of it. What you can afford to pay has nothing to do with what a "good CPC" is supposed to be in your industry. It comes out of your margin.
Two shops selling the same product at the same price can afford wildly different clicks, purely because one keeps more of every sale. Work out the return you need before you decide any click was too expensive.
Reading about the mechanics is one thing. Watching them play out in a live account is another. The two places this goes wrong most often in practice are the feed and the measurement, which is why the Shopping ads guide and the post on how conversion tracking breaks both go deeper than this primer does.
See exactly how this plays out in a real Shopping account.
97 items, the exact sequence I run on every new account, feed setup through bid strategy. One-time, lifetime access.
Senior Google Ads operator with 8+ years of experience, spent the last years almost entirely inside DTC eCommerce accounts. Small number of accounts, no juniors, no handoffs.