Blocklisted inventories refer to certain types of digital media placements or websites that are deemed inappropriate or of low quality, and are therefore excluded from advertising campaigns. This can include websites with adult content, hate speech, or misleading information, as well as websites with low engagement or poor user experience.

Advertisers use blocklists to ensure that their advertisements are only displayed on high-quality websites that align with their brand image and target audience. This helps to protect the advertiser's reputation and to maximize the impact of their advertising spend.