Blacklist
A blacklist is a list of prohibited or unwanted sources, users, sites, or platforms that a system or advertiser does not want to interact with.
Simply put:
This is a list of “who is not allowed”
Where It Is Used in Marketing
1.Advertising
A list of sites or apps where ads are forbidden to run.
For example: low-quality or fraudulent platforms.
2.Email Marketing
- Blocking spam addresses
- Excluding invalid or malicious domains
3.Affiliate & Traffic Arbitrage
- Sources of fraud
- Low-quality or bot traffic
4.Brand Safety
Protecting against ads appearing on inappropriate resources.
Example
An advertiser creates a blacklist:
- Sites with bot traffic
- Pirate resources
- Platforms with low audience quality
Ads are not shown there.
Why a Blacklist Is Useful
It helps to:
- protect the brand from negative associations;
- reduce ad fraud;
- improve traffic quality;
- increase ROI of advertising campaigns;
- avoid untargeted impressions.
Opposite: Whitelist
- Whitelist — approved sources
- Blacklist — prohibited sources
Together, they help manage placement quality.
Key Takeaway
A blacklist is a list of prohibited sources or participants that a system does not work with.
It is used to protect budget, brand, and traffic quality in marketing and advertising.
