Pay-per-Click (PPC)

Pay-per-click (PPC) is an online advertising billing model in which you pay a fee each time someone clicks on your ad, not when the ad is displayed. The model underpins most performance advertising today, from search campaigns on Google to sponsored posts on LinkedIn, and is available wherever platforms charge advertisers based on user interaction rather than exposure.

How PPC Works

When you run a PPC campaign, you bid on keywords, audience segments, or both. Each time a user's search query or profile matches your targeting, the platform runs an auction in milliseconds. Your position is calculated from your maximum bid and a quality signal, which incorporates factors such as expected click-through rate and landing page relevance. You are charged only when a user clicks.

The main platforms that operate PPC auctions are Google Ads (the dominant search network), Microsoft Ads (covering Bing and affiliated partner sites), LinkedIn Ads (widely used for B2B targeting), and Meta Ads on Facebook and Instagram. For a broader look at how each paid channel fits into an overall advertising mix, see Online Advertising: Channels, Costs and First Steps.

PPC vs. CPC and SEA: Where the Terms Differ

Three terms appear together so often in paid advertising that they are routinely used as synonyms. Each describes something different.

PPC vs. CPC. PPC (pay-per-click) describes the billing model you choose when setting up a campaign: you agree to pay per click rather than per impression. CPC (cost-per-click) is a performance metric that records the average amount you actually paid per click once a campaign has run. You choose a PPC model; you report a CPC result afterwards. A campaign running on PPC billing might finish the week with an average CPC of €1.20. The two concepts move together but describe different moments in the same process.

PPC vs. SEA. SEA (Search Engine Advertising) is a channel discipline covering all paid advertising on search engine results pages. PPC is one billing method within SEA, but not the only one: platforms also offer CPM (cost-per-thousand-impressions) or CPV (cost-per-view) billing for certain ad formats. Equally, not all PPC advertising is SEA: LinkedIn, Meta, and display networks all charge on a PPC basis without being search engines. The overlap is large, but the two terms are not interchangeable.

The distinction also matters when you measure campaign outcomes. A metric like ROAS (Return on Advertising Spend) sits downstream of both: it measures how much revenue a campaign generates per unit of spend, regardless of whether the billing model was PPC or CPM.

Example Scenario

Example scenario (illustrative figures, not real campaign data): A software business targets the keyword "project management tool" and sets a maximum bid of €2.00 per click. Over one week the ad receives 400 clicks, but the actual average CPC charged is €1.25, because competitors bid less aggressively for many of that week's query variations. Total spend for the week: €500. The business records 10 trial sign-ups from those clicks. Whether €500 was a sound investment depends on what a trial sign-up is worth in downstream revenue. For a detailed look at how Google calculates the actual price you pay and what factors push costs higher or lower, see How much does advertising cost on Google?

Why PPC Matters for Your Campaigns

PPC's defining property is that spend tracks engagement, not exposure. Budget is consumed only when someone actively chose to click, which makes it easier to connect advertising cost directly to traffic volume and, by extension, to conversion outcomes.

Unlike organic search, which takes months to produce consistent rankings, PPC can place an offer at the top of a search results page from the day a campaign goes live. This makes it particularly useful for product launches, seasonal promotions, or testing a new market quickly. The decision to enter PPC is one even brands with strong organic presence eventually face: the 2024 case of Tesla committing to paid advertising for the first time illustrates the trade-offs involved, covered in depth in Tesla's 2024 entry into paid advertising.

Working with PPC in Practice

For most advertisers, Google Ads is the natural starting point: it reaches the largest search audience and offers granular controls over keywords, match types, bidding strategies, and audience layering. Getting the setup right, from campaign structure to bid strategy, is what determines whether your PPC budget translates into useful traffic or wasted spend. The Google Ads agency overview at marketer UX explains what professional campaign management covers and where hands-on support adds the most value.