How Google Ads works: the basics

How is a Google Ads account organized?

Understanding how Google Ads works starts with the account structure. Each level carries its own settings. A mistake at one level affects everything below it.

Level	What you set there	Example (fictional bike shop)
Account	Access, billing, time zone, tracked conversions	Online bike shop
Campaign	Budget, campaign type, networks, locations, languages, bid strategy	Electric bikes, all of France
Ad group	One precise theme: closely related keywords and associated ads	Folding electric bikes
Ads and keywords	Texts, landing page, keywords and match types	“folding electric bike”, dedicated ad

Google recommends a separate campaign as soon as the budget or geographic targeting differs. Each ad group is built around a single theme. Organize the account from the start: reorganizing it late loses the accumulated history (Google Ads Help on account organization).

Choosing the campaign type and its settings is detailed in our page on Google Ads campaigns. The acronyms (CPC, CTR, CPA, ROAS) are defined in our SEA glossary.

How does Google Ads work between the search and the ad?

Everything happens in a fraction of a second, with every search. Google runs an ad auction every time someone searches or visits a site that shows ads (Google Ads overview).

1. The query arrives: the user types “light folding electric bike” from Lyon, on mobile, at 9 p.m.
2. Keywords filter: the match type of each keyword decides whether it is eligible. Broad match can cover searches that do not contain the exact words.
3. Ads are sorted: ad approved, location and schedule targeted, budget still available.
4. The auction takes place: Google calculates the Ad Rank of each ad, placement by placement.
5. Thresholds apply: an ad below the minimum threshold of a placement is not shown there, whatever the bid.
6. The click is billed: if the user clicks, you pay the actual CPC, not your maximum bid.

The gap allowed between keyword and query depends on match types. There are three: broad match, phrase match and exact match. Their practical use is covered in keywords and ads.

How does Google Ads rank ads?

Ad Rank decides both whether an ad can show and in which position. Google runs a separate auction for each placement on the page. The first position is not decided in the same auction as the third (Google Ads Help on Ad Rank). Six factors go into the calculation:

• your bid, meaning the most you accept to pay for a click;
• the quality of the ad and of the landing page, assessed at auction time;
• the minimum Ad Rank thresholds, higher for placements above the results;
• the competitiveness of the auction against other advertisers;
• the context of the search: terms, location, device, time, other results shown;
• the expected impact of assets (sitelinks, phone number, location).

Quality Score is rated from 1 to 10 in the interface. It is a diagnostic tool, not a direct factor in the auction. The nuance is explained in our page on Quality Score.

How much does a click cost and how is the budget spent?

The actual cost per click is the final amount charged. Google states that it is often lower, sometimes much lower, than the maximum CPC. You pay the minimum needed to meet the thresholds and beat the ad ranked just below. With no competitor below, you pay the reserve price (Google Ads Help on actual CPC).

A simplified example, following the logic of Google’s help: two advertisers aim for the top of the page. Their Ad Ranks are 80 and 50. The first does not pay its maximum bid. It pays what it takes to rank ahead of the second, rounded to the cent.

The practical consequence: think in monthly budget. A daily budget of €20 gives a monthly cap of €608 (20 × 30.4). Some days will be busier than others depending on traffic.

Why does conversion measurement change everything?

Google Ads can count clicks without any setup. Without you, it cannot know which ones become sales, quote requests or calls. Conversion measurement links each keyword, ad and campaign to the actions that matter to the business.

It also determines how automated bidding performs. Google sorts conversion actions into two groups: primary (used for bidding) and secondary (observation only). A poor setup prevents Smart Bidding from optimizing correctly (Google Ads Help on conversion measurement).

Automated strategies are detailed in our page on Smart Bidding. Setting up tracking is covered in the web analytics pillar.

What should you monitor once the ads are live?

Google Ads is not a “set it and forget it” channel. Google advises signing in at least once a week. Plan between 30 minutes and an hour to check ads and keywords (same Google Ads overview).

• Actual queries: what users typed, so you can add keywords to exclude.
• Cost per conversion: campaign by campaign, compared with what a customer brings you.
• Lost visibility: budget exhausted too early or insufficient Ad Rank.
• Landing pages: an ad that promises what the page does not deliver is expensive.

For the audit method and improvement levers, see audit and optimization. To place Google Ads alongside organic search, read SEO and SEA. For an overview of the lever, see our SEA guide: understanding how Google Ads works remains the first step.