How Does Google Ads Work? A Plain-English Guide

Google Ads can put your business at the top of Google within hours. It can also burn through your budget just as quickly if you don't understand how it works. Most business owners I speak to have either tried it and been disappointed, or been put off by how complicated it looks.

The good news is that the basics are simpler than they seem. In this guide I'll explain how Google Ads works in plain English: the ad auction, what you actually pay, how Google decides whose ad appears first, and which campaign types suit which businesses. If you'd rather have it managed for you, take a look at our Google Ads management service.

What Is Google Ads?

Google Ads (formerly Google AdWords) is Google's online advertising platform. It lets businesses show adverts in Google search results, on YouTube, across millions of websites and apps, in Gmail and on Google Maps.

The most common form is the search ad: the text adverts marked "Sponsored" that appear above and below the normal search results. When someone searches for "emergency plumber Sheffield", the first results they see are usually ads.

Google Ads is a pay-per-click (PPC) platform. In most campaigns, you pay only when someone clicks your ad, not when it's shown. That's why Google Ads is often simply called PPC.

In simple terms: you choose the searches you want to appear for, set a budget, and pay Google each time someone clicks through to your website.

How Does Google Ads Work? The Auction Explained

Every time someone searches on Google, an instant auction takes place to decide which ads appear and in what order. It happens in a fraction of a second, millions of times a day.

Step 1: You choose keywords

Keywords are the search terms you want your ads to appear for, such as "boiler repair Leeds" or "oak staircases". You also choose match types, which control how closely a search must match your keyword:

• Broad match: your ad can show for related searches, including ones that don't contain your keyword
• Phrase match: the search must include the meaning of your keyword
• Exact match: the search must have the same meaning as your keyword

You can also add negative keywords, which stop your ads showing for irrelevant searches such as "free", "jobs" or "DIY".

Step 2: You set a bid

Your bid is the maximum you're willing to pay for a click. Most campaigns now use automated bidding, where Google sets bids for each auction based on your goal, such as getting as many conversions as possible within your budget.

Step 3: Google calculates your Ad Rank

Google doesn't simply show the highest bidder first. It calculates an Ad Rank for each advertiser, based on:

• Your bid
• Your ad quality, summarised as Quality Score
• The context of the search, such as location, device and time
• Your ad assets, such as extra links, phone numbers and callouts

Step 4: The ads are shown

The ads with the highest Ad Rank appear in the top positions. That means a well-run campaign with high-quality ads can beat a competitor with a bigger bid, and often pay less per click.

What Is Quality Score?

Quality Score is Google's 1–10 rating of how relevant and useful your ads are for a keyword. It's based on three things:

• Expected click-through rate: how likely people are to click your ad
• Ad relevance: how closely your ad matches the search
• Landing page experience: how relevant, fast and useful the page is that people land on

A higher Quality Score generally means better ad positions at a lower cost. This is why landing pages matter so much, and why a fast, well-designed page is one of the best investments you can make in your ads. Our web design team builds landing pages with this in mind.

What Do You Actually Pay?

You never pay more than your maximum bid, and often you pay less. Your actual cost per click depends on the competition for that search and on your Ad Rank.

You also control your spend with a daily budget. Google may spend a little more than your daily budget on busy days, but over a month you won't be charged more than your average daily budget multiplied by the average number of days in a month.

Costs vary hugely by industry. A click for a local trade search might cost a pound or two, while competitive legal or financial searches can cost much more. See our full guide to Google Ads costs in the UK.

The Main Google Ads Campaign Types

For most small service businesses, Search campaigns are the best starting point, because they reach people who are actively looking for what you offer. Online shops usually benefit from Shopping or Performance Max. Read more in our guides to Google Shopping, display ads and Local Services Ads.

Where Do Google Ads Appear?

Depending on your campaign, your ads can appear:

• At the top and bottom of Google search results
• In the Shopping tab and product listings
• On Google Maps
• On YouTube, before and during videos
• On millions of partner websites and apps
• In Gmail

You can control where your ads appear, which locations you target, which devices you show on and what times of day your ads run.

What Makes a Google Ads Campaign Profitable?

Running ads is easy. Running profitable ads takes more care. The campaigns that make money usually have:

• Tightly focused keywords that match what real customers search for
• A strong list of negative keywords to block wasted clicks
• Compelling, specific ad copy with a clear reason to click
• Fast, relevant landing pages that make it easy to enquire or buy
• Accurate conversion tracking, so you know which clicks turn into customers
• Regular optimisation, based on real data rather than guesswork

Without conversion tracking in particular, you're flying blind. You might know how much you're spending, but not what it's bringing in.

Why Google Ads Can Feel So Complicated

Google Ads has grown into a powerful but complex platform. There are dozens of settings, and many of the defaults are designed to spend your budget, not protect it. Broad match keywords, automatically applied recommendations and expanded placements can all send clicks your way that never had a chance of converting.

That's why many businesses either struggle to get results or hand their account over to a specialist. Our guide to setting up Google Ads walks you through the key settings if you want to do it yourself.

Final Thoughts

Google Ads works by matching your ads to the searches your customers make, then charging you when they click. The businesses that profit from it are the ones that choose the right keywords, write relevant ads, send people to strong landing pages and track what happens next.

Want to know whether your Google Ads account is working as hard as it should? Get a free audit of your website, SEO and ads.