Quality Score is a grade that Google gives your keywords.
10/10: Perfect. Your ad is helpful and relevant.
1/10: Terrible. Your ad is not relevant to what people are searching for.
Why does it matter? Google rewards high-quality ads with lower prices.
Your score comes from three specific data points:
Expected Click-Through Rate (CTR): Does Google think people will click your ad? If your past performance is good, this score goes up.
Landing Page Experience: Does your website load fast? Is it easy to read? Do people stay on the page or leave immediately?
Ad Relevance: Does the text in your ad match the keyword the user searched for?
Deep Dive on Ad Relevance: If a user searches for "Red Tennis Shoes":
Ad A says: "Buy Red Tennis Shoes." (High Relevance).
Ad B says: "We Sell Sports Equipment." (Low Relevance).
Ad C says: "Blue Trucks for Sale." (Zero Relevance).
To fix low Ad Relevance, make sure your keywords are actually written inside your Ad Headlines.
Think of Quality Score like a multiplier for your money.
The Discount (Score 7-10): Google wants to show your ad because users like it. They might charge you 30-50% less per click.
The Neutral Zone (Score 4-6): You pay the market average.
The Penalty Tax (Score 1-3): Google thinks your ad is annoying or irrelevant. They will charge you up to 400% more just to show your ad.
Simple Rule: If your CPC is very high, check your Quality Score first. You might be paying the "Penalty Tax."
Your Quality Score relies heavily on Click-Through Rate (CTR) and User Behavior. Click fraud attacks can destroy both of these:
Competitor Sabotage: A competitor's bot searches for your keyword 1,000 times but never clicks your ad. This makes your CTR look terrible (0%), which drops your Quality Score.
Bounce Rates: A bot clicks your ad but leaves the website in 0.1 seconds. Google sees this and thinks, "This landing page must be bad," and lowers your score.
The Fix: Using ClickSambo prevents these bad interactions.