PPC, or pay-per-click, is an online advertising model where you bid for ad placement and pay only when someone clicks your ad, not when it is shown.
Most people meet PPC through Google Ads, but the model is everywhere: Microsoft Advertising, Meta and almost every ad network bill the same way. On a search engine it runs as an auction. Every time someone types a term you have bid on, Google holds an instant auction and ranks the eligible ads using Ad Rank, a score that combines your bid, the quality of your ad and landing page, and the context of the search. A bigger bid does not buy the top spot on its own. A tighter, more relevant ad often beats a higher bidder, which is why PPC rewards craft, not just budget.
The pricing is the part the name describes. You set a maximum cost-per-click, the most you will pay for a click, but you are usually charged less, only enough to edge out the advertiser ranked below you. The mechanics of that number sit in cost-per-click. The discipline itself is three decisions made well and repeatedly: which searches are worth bidding on, what the ad has to say to earn the click, and whether the page behind it converts.
Two things make PPC measurable in a way older advertising never was. Every click traces back to a search term, an ad and a device, and you can switch the whole campaign off in seconds. That feedback loop, which keyword booked a job and which one wasted spend, makes PPC a research tool as much as a sales channel.
What PPC competes against has shifted. A Google results page in 2026 is no longer ten blue links with a few ads stacked on top. AI Overviews now answer many queries before the links begin, and Google has started placing ads inside those overviews in twelve countries including Australia. At the same time Google is folding its older formats into AI: Dynamic Search Ads and campaign-level broad match upgrade to AI Max for Search from September 2026. The work is moving away from bidding on exact-match keywords and toward feeding Google's AI the right goals, assets and audience signals, the model behind Performance Max.
The reason a small business reaches for PPC is speed. A Brisbane plumber who switches on a campaign for "emergency plumber Brisbane" can be taking calls the same afternoon, where earning that position organically would take months. The catch is that the traffic stops the moment the budget does, the whole tension in Google Ads vs SEO. Run well, PPC is not a rival to organic search, it is the fast lane that buys leads and conversion data while the slower, compounding work builds underneath it.
Our SEO & AI Visibility service treats paid and organic search as one system, because the page that converts an ad click is the page that earns an AI citation.