Ad injection, often called adware or malicious ad injection, is a deceptive advertising practice where advertisements illegitimately infiltrate a publisher’s website through malicious software. This form of impression ad fraud involves the introduction of new ads or substituting existing ones while users are engaged in their web browsing sessions. Consequently, ad injection allows third-party applications to profit from users’ browsing activities at the expense of the original website publishers.

Ad injection manifests in various forms. In one scenario, additional ads are overlaid on top of the pre-existing ones, rendering the original advertisements invisible and negatively impacting the publishers’ viewability ratings. Alternatively, injected ads can replace other advertisements or appear on web pages that the website publishers did not initially intend to advertise.

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