Fundamentals
What is PPC?
How the ad auction works, what you are actually bidding on, where the money goes, and the vocabulary you need to hold a useful conversation about it.
The basic trade
Buying attention by the click
Pay per click advertising is exactly what the name suggests. A platform (usually Google or Microsoft) charges you a fee whenever a person clicks the ad. You are not paying for the right to be seen. You are paying for the right to be visited.
When you place an ad in a magazine, you pay for distribution. You pay the publisher based on how many people they claim will look at the page. If the phone rings, the ad worked. If it stays silent, you still pay the invoice.
PPC flips that dynamic. You do not pay for distribution. Your text ad can appear on a search results page a thousand times, and if nobody clicks it, your cost is zero. You only pay when a user decides your ad is relevant enough to warrant their attention and physically clicks through to your landing page.
This sounds inherently safe. It is not. The danger in PPC is not that you will pay for nothing. The danger is that you will pay for the wrong something. A click from a qualified buyer looks identical in the platform dashboard to a click from a teenager researching a school project. Both cost you three dollars. Only one has a chance of returning it.
The Mechanism
How the auction actually resolves
The search results page is not a static billboard. It is a live trading floor. Every time a user types a query into Google, an auction occurs in the milliseconds before the page loads.
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01
The user queries the engine
Someone searches for "commercial roofer fort myers". The platform immediately checks its advertiser database to see who is bidding on keywords related to that exact phrase.
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02
The platform filters the bids
It drops advertisers whose daily budgets are exhausted, whose location settings do not cover Fort Myers, or whose ads are disapproved. What remains is the active pool of bidders.
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03
The auction ranks the participants
The platform calculates a score for each remaining advertiser. It multiplies your maximum bid by your Quality Score (a measure of how relevant and useful your ad is). The highest combined score wins the top slot.
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04
The price is calculated
You do not pay your maximum bid. You pay exactly one cent more than the minimum amount required to beat the rank of the advertiser directly below you. If the person below you bid terribly, you get a steep discount.
The Vocabulary
The metrics that matter
Advertising dashboards contain dozens of metrics. Most of them are noise designed to make you feel like progress is happening even when your bank balance is shrinking. If you want to hold an agency or an in house team accountable, you only need to understand five terms.
| Term | Meaning |
|---|---|
| Impression | A single instance of your ad appearing on a screen. If you have a million impressions and zero clicks, your ad is visible but ignored. |
| Click Through Rate (CTR) | The percentage of impressions that turn into clicks. A high CTR means your ad text matches the user\'s intent. |
| Cost Per Click (CPC) | What one click costs you on average. The auction sets this figure, not you. |
| Conversion Rate | The percentage of clicks that result in a meaningful action on your website: a sale, a phone call, or a lead form submission. |
| Cost Per Acquisition (CPA) | The total cost of your clicks divided by the number of conversions. This is the only number that dictates whether the campaign is profitable. |
The Common Mistakes
Where the money leaks
Because the barrier to entry for PPC is simply a credit card, the platforms make it incredibly easy to start spending. They set the default campaign settings to maximize their revenue, not yours. If you launch an account without changing those defaults, you will bleed cash through three common mechanisms.
1. The Broad Match trap
Keyword match types dictate how closely a user\'s search must match your chosen keyword. By default, Google assigns keywords as "Broad Match." This gives the algorithm permission to show your ad for queries it deems tangentially related. If you bid on the broad match keyword leather boots, your ad might show for how to clean leather boots or faux leather boots. You end up paying for traffic with zero buying intent.
2. The Display Network expansion
When you build a search campaign, the platform often defaults to opting you into its Display Network as well. This means your text ad will stop being shown exclusively to people actively searching for your service, and will start appearing on random blogs, mobile apps, and weather websites. The intent drops to near zero, but the clicks still cost you money.
3. Treating the algorithm as infallible
Modern PPC relies heavily on machine learning. The platforms prefer you to give them a budget, a goal, and let them handle the bidding. But algorithms lack business context. They do not know that a lead generated at 2:00 AM on a Sunday never converts into a paying contract, or that your margin on Product A is triple your margin on Product B. If you do not constrain the algorithm with tight negative keyword lists, clean data, and strict location targeting, it will optimize for volume over profitability.
Questions
Frequently asked questions
Is PPC the same thing as SEO?
No. Search Engine Optimization (SEO) means earning a better organic ranking, which costs you time rather than placement fees. PPC (Pay Per Click) means buying the placement outright, and you are charged whenever a person clicks. When the budget stops, the traffic stops.
Do I pay if my ad is shown but not clicked?
In a pure search campaign, no. You only pay when a user physically clicks the ad and is directed to your website. Impressions (views) are free. In display or social campaigns, you might pay per thousand impressions instead, depending on the setup.
Why does the cost per click change every day?
Because every search is a live auction. The cost depends on how many competitors are bidding on that exact query at that exact moment, their respective quality scores, and the time of day. It fluctuates constantly.
Next step
Find out what your account is wasting
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