PPC (pay-per-click) is a digital advertising model where advertisers pay a fee each time their ad is clicked. The most common form is search engine advertising — placing ads at the top of Google or Bing results for specific keywords. PPC also covers social media ads (Meta, LinkedIn, TikTok), display advertising across websites, and YouTube video ads. You only pay when a user actively clicks your ad, making it a highly measurable, controllable way to drive targeted traffic to your website.
If you have ever searched for something on Google and seen a result with the word 'Sponsored' next to it, you have seen PPC advertising in action. The advertiser behind that listing paid to appear when you typed those specific words — and will only be charged if you clicked. That mechanic — paying for results rather than exposure — is what makes PPC one of the most widely used and accountable forms of digital marketing.
How does PPC advertising work?
PPC operates through an auction system. When a user submits a search query, the ad platform (Google, Bing, Meta, etc.) runs a real-time auction to determine which ads to show and in which order. Advertisers bid on keywords — specifying the maximum amount they are willing to pay per click. But the ad position is not determined by bid alone. Google, for example, uses a Quality Score — a combination of your bid, the relevance of your ad to the keyword, and the expected quality of your landing page — to calculate Ad Rank.
This means a well-structured campaign with highly relevant ads and landing pages can outrank a competitor with a higher bid but lower quality. Conversely, irrelevant or poorly designed campaigns will pay more per click and get fewer impressions. Getting the structure, targeting, and creative right is what separates profitable PPC from expensive click-buying.
The main types of PPC advertising
Search advertising (Google Ads / Microsoft Ads)
Text ads that appear at the top and bottom of search engine results pages for specific keyword queries. This is the highest-intent form of PPC — users are actively searching for your product or service at the moment they see the ad. Google Ads is the dominant platform; Microsoft Advertising (Bing) covers a smaller but valuable audience and typically has lower cost-per-click.
Social media advertising (Meta, LinkedIn, TikTok)
Ads that appear in social media feeds, stories, and sidebars. Unlike search ads (which target intent), social ads target audiences based on demographic data, interests, and behaviours. Meta Ads (Facebook and Instagram) is the most widely used social PPC platform for consumer brands. LinkedIn Ads is the primary platform for B2B companies targeting by job title, industry, or company size. TikTok Ads is increasingly effective for reaching younger audiences with short-form video.
Display and programmatic advertising
Visual banner, image, or video ads that appear across websites and apps in advertising networks. Display ads are less intent-driven than search ads but effective for building brand awareness and retargeting — showing ads to users who have previously visited your website but not converted.
Shopping ads (Google Shopping / Performance Max)
Product listing ads that show an image, price, and product name directly in search results. Essential for e-commerce businesses — when someone searches 'buy running shoes UK', Shopping ads appear before standard text ads and generate high-quality commercial traffic.
How much does PPC cost in the UK?
PPC costs have two components: the ad spend (money paid directly to the platform — Google, Meta, etc.) and the management fee (paid to your agency or in-house manager to set up and run the campaigns). Ad spend varies enormously by industry. Competitive sectors like legal services, insurance, and financial products can have cost-per-click rates of £10–£50+. Less competitive niches might see clicks for under £1. The average UK Google Ads cost-per-click across all sectors is approximately £1.50–£3.00.
Agency management fees for PPC in the UK typically range from 15–20% of ad spend (with a minimum monthly fee of £500–£1,000) or a flat monthly retainer. A realistic minimum effective investment for a UK SMB running Google Ads would be £1,500–£3,000/month total (ad spend plus management) to generate enough data and volume to optimise the campaign properly.
PPC vs SEO: what is the difference?
PPC and SEO both aim to drive traffic from search engines, but through fundamentally different mechanisms. PPC delivers immediate, controllable traffic at a direct cost — the moment you pause spending, the traffic stops. SEO builds organic rankings that persist and compound over time, but requires months of investment before significant results appear and involves no direct cost per click. The two channels are complementary: PPC covers high-intent queries immediately while SEO builds long-term organic visibility; many successful businesses run both.
Key PPC metrics every business should understand
- CPC (Cost Per Click) — the average cost paid each time someone clicks an ad
- CTR (Click-Through Rate) — the percentage of users who see the ad and click it; higher CTR improves Quality Score and lowers CPC
- Conversion Rate — the percentage of clicks that result in a desired action (purchase, lead, sign-up)
- CPA (Cost Per Acquisition) — the total cost to generate one conversion; the primary efficiency metric
- ROAS (Return on Ad Spend) — for e-commerce, the revenue generated per £1 of ad spend; a ROAS of 4:1 means £4 revenue per £1 spent
- Quality Score — Google's rating (1-10) of ad relevance and landing page quality; higher scores lower your CPC
- Impression Share — the percentage of available auctions in which your ads appeared; low share indicates budget or quality constraints
Frequently asked questions about PPC
PPC can be very effective for small businesses, particularly for driving immediate leads while SEO is being built. The key is matching budget to ambition — a £300/month Google Ads budget in a competitive sector will not generate enough volume to be statistically meaningful. PPC works best for small businesses when the target keywords have manageable CPC rates, the landing page is well-designed for conversion, and there is someone with the skills to monitor and optimise the campaigns regularly.
PPC can start generating clicks, leads, and sales within hours of going live, making it one of the fastest digital marketing channels. However, the first two to four weeks of a new campaign are a learning phase — the platform's algorithm is gathering data to optimise delivery. Initial cost-per-acquisition is typically higher than steady-state performance. Most campaigns reach their performance baseline after six to eight weeks of active optimisation.
A ROAS of 4:1 (£4 revenue per £1 ad spend) is commonly cited as a benchmark for e-commerce, but the right target depends on your product margins. If your gross margin is 20%, you need a ROAS of at least 5:1 to break even on ad spend before accounting for other costs. For lead generation businesses, CPA (cost per acquired customer) is more relevant than ROAS — and what constitutes a good CPA depends entirely on your average customer lifetime value.
Technically, anyone can set up a Google Ads account and run campaigns. In practice, the auction-based pricing system heavily penalises poor campaign structure, irrelevant targeting, and weak ad creative — meaning a poorly managed campaign will cost significantly more per click and conversion than a well-managed one. For businesses spending over £2,000/month on PPC, the efficiency gains from specialist management typically far outweigh the management cost.