Advertising injection refers to the practice of inserting advertisements into digital content, such as websites, apps, or videos, without the explicit consent of the user. This intrusive form of advertising often disrupts the user experience and can be seen as a violation of privacy. It is typically done through the use of adware or malware, and can result in the display of unwanted pop-up ads, redirects to promotional websites, or the collection of personal information. Advertising injection is a controversial tactic used by some companies to increase their revenue, but it is often met with frustration and backlash from users.