AdWords is the old name for Google's advertising programme. It has officially been called Google Ads since 2018. Anyone who says "AdWords" today almost always means Google Ads - the term lives on in everyday language because it was synonymous with paid search ads for fifteen years. You use AdWords or Google Ads to place adverts that appear in Google search results, on YouTube, in the Display Network and in Gmail. You usually pay per click, not per display. That is the core, and the reason why the system has become so central to e-commerce.
The renaming was more than cosmetic. "AdWords" described the original idea: advertising based on search terms. Today, Google Ads encompasses far more formats and channels. Nevertheless, the centrepiece has remained the same: You bid to be visible for certain search queries and pay when someone clicks.Why paid search ads count in e-commerce
Search ads hit people the moment they express an intention. People who google "running shoes waterproof" don't want to be inspired, they want to be supplied. This intention to buy is the reason why search advertising converts so well in retail: You're not advertising into the blue, you're responding to a specific demand. In marketing jargon, this is the discipline with the most direct link between click and sales.
For an online shop, this means that you can use Google Ads to buy traffic that has a measurable probability of conversion - immediately. SEO takes months for a page to rank organically. An ad campaign takes hours. This makes paid search the standard tool when a new shop, a new product or a season needs reach quickly.The downside, to be honest: as soon as you stop paying, the traffic is gone. Paid search is rent, not ownership. This is exactly why the combination of SEO (build organic visibility) and Google Ads (buy short-term) is the usual, sensible strategy - not one versus the other.
How the auction and bidding system works
Behind every search advert is an auction that runs in real time as soon as someone searches. But it's not just the highest bid that wins. Google calculates an advert rank based on two main factors: the bid and the quality score. The quality score evaluates how relevant and well your advert and the landing page behind it match the search query. The simplified logic:
- Bid: the maximum amount you are willing to pay per click .
- Quality factor: an assessment of ad relevance, expected click-through rate and user experience on the landing page.
- Ad rank: roughly the product of both, plus contextual factors. If you have a highly relevant ad with a good landing page, you can place a lower bid and still rank above a competitor with a higher bid.
This is the often underestimated point: Google rewards relevance, not just budget. A poorly constructed campaign with a high bid can be more expensive and at the same time rank worse than a well thought-out campaign with a moderate bid. The official explanation of how the ad rank is determined can be found in the Google Ads help centre at support.google.com on ad rank.
The most important key figures
Those who manage Google Ads live with a handful of key figures. Understanding them is half the battle, because they determine whether a campaign makes or burns money
.| Key figure | Meaning | Example value |
|---|---|---|
| CPC (Cost per Click) | What a click costs on average | €0.85 |
| CTR (click-through rate) | Percentage of impressions that lead to a click | 4.2% |
| Conversion rate | Percentage of clicks that lead to an order | 3.5% |
| CPA (cost per acquisition) | Advertising costs per order | €24 |
| ROAS (Return on Ad Spend) | Revenue per invested advertising euro | 4.5 (450%) |
The decisive key figure in retail is almost always the ROAS or CPA in relation to the margin. A ROAS of 4.5 sounds good, but is worthless if your margin is so thin that you still pay more for every advertised order. Advertising success is measured by the contribution margin, not by sales alone.
Campaign types that really count in the shop
Google Ads offers many formats. Three are particularly relevant for online shops:
- Search campaigns: Text adverts above and below the organic search results. The classic form, driven by keywords and search intent.
- Shopping adverts: Product adverts with image, price and shop name, fed from a product data feed. Often the form with the highest turnover for e-commerce because the user can see the product and price before clicking. Performance Max: an AI-controlled campaign type that plays out automatically across all Google channels. Convenient, but a black box - you hand over a lot of control to Google's automation.
- No proper conversion measurement If you don't track which clicks turn into orders, you are blindly optimising for clicks instead of sales. Conversion tracking is the basis, not the extra. No keyword exclusions Without excluding keywords, you are paying for irrelevant search queries. A shop for new goods, for example, should have "used" or "free" as a negative keyword.
- Advertisement points to the homepage If you advertise "waterproof running shoes" and link to the homepage instead of the appropriate category, you are giving away conversions and reducing the quality factor.
- Performance Max without control. The convenient automatic type can divert budget into brand search queries that would have converted anyway, thereby optimising the ROAS. Look, don't trust blindly.
- Optimising sales instead of contribution margin The most common strategic mistake. A campaign with high sales and a thin margin can be more expensive than none at all.
A concrete example with a Shopware shop
A Shopware shop sells high-quality garden furniture and launches a shopping campaign in spring. The team connects the product data feed from Shopware via the Google Merchant Centre and sets a daily budget of 50 euros. The figures are available after three weeks: an average CPC of 0.60 euros, a conversion rate of 2.8 per cent and an average order value of 380 euros.
This results in a CPA of around 21 euros per order. With an order value of 380 euros and a margin of 35 per cent (around 133 euros gross profit), there is clearly money left over after deducting the advertising costs - the campaign is paying for itself. The team also realises that a certain product group (lounge sets) is the main source of success, while individual chairs hardly convert at all. Consequence: reallocate budget to the winners, remove individual chairs from the active feed. It is precisely this granularity that is the strength of the system - you can see not only that advertising is working, but where.Typical mistakes
Understanding keyword options
An often underestimated detail in search campaigns are the keyword options. They control how exactly a search query must match your stored keyword for your advert to appear. If you don't understand this, you are either paying for irrelevant search queries or giving away reach.
| Option | Triggering the advert | Risk |
|---|---|---|
| Wide match (broad match) | For thematically related search queries, even without the exact word | High reach, high scatter loss |
| Matching phrase (phrase match) | If the search query contains the meaning of the phrase | Balanced, medium effort |
| Exact match (Exact Match) | Only if the meaning is very similar to the exact search query | Low range, high precision |
The usual recommendation for beginners: start narrow (phrase or exact), keep scatter loss and budget under control and only open when the campaign is running profitably. If you start with a largely appropriate approach, you often end up burning budget in search queries that have nothing to do with the offer.
Manual and automatic bidding strategies
You no longer have to set every bid manually. Google Ads offers a range of bidding strategies that align bidding with a defined goal. The most important distinctions:
- Manual CPC: You set the bids yourself. Maximum control, a lot of maintenance. Useful for small, manageable campaigns or for learning.
- Maximise conversions: The automatic system gets as many conversions as possible with the budget. Practical, but without a target CPA it can be expensive.
- Target CPA: You specify how much an order may cost and Google controls the bids accordingly. Good choice as soon as enough conversion data is available .
- Target ROAS: You specify a target revenue per advertising euro. The most demanding, but often the most suitable strategy for margin-conscious shops.
- Ads buy time, SEO builds substance As long as a page does not yet rank organically, paid search maintains visibility. If SEO takes hold, you can reallocate the budget. Search data from ads helps SEO You can often see which keywords convert faster in ads than via organic data. These insights flow back into the content strategy.Remarketing closes the circle. Anyone who has been to the shop but not made a purchase can be approached again via the display network. This is often cheaper than a first contact.
The catch with all automatic strategies is that they require data. A fresh campaign with five conversions per month does not provide the algorithm with enough data to make sense. Only once a certain amount of conversions has been achieved do the automated systems really come into their own. Until then, manual control or "maximising conversions" with a tight budget is often the more honest approach. If you switch to target ROAS too early, you will be surprised why the campaign is hardly ever played out.
AdWords, SEO and the rest of the marketing mixPaid search never stands alone. It complements organic visibility (SEO), social marketing and newsletters. A few principles for the interaction:
A sober conclusion on expectations: Google Ads is transparent in its figures, but merciless in its economics. You see every cent you spend and every click you get. It is precisely this transparency that quickly exposes poorly constructed campaigns. That's a good thing. If you look, you can control. If you put your account on autopilot and only look at the end of the month, you'll realise too late that your budget has been wasted on the wrong search queries.
The bottom line is that AdWords or Google Ads is not a button that you press and get sales. It is an auction system that rewards relevance and penalises negligent management. For online shops, it remains one of the most direct tools for reaching users who are ready to buy at the exact moment of their search, provided you measure accurately, think in terms of contribution margins and don't leave the control completely to automation. If you take this to heart, you buy predictable, profitable traffic. Those who ignore it are primarily financing Google's quarterly figures.