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Advertisements, also called ads in the US and adverts in the UK, are part of the Evil-But-Necessary Unholy Trinity. The other two members are infomercials and commercials. Out of the three, advertisements are by far the shortest with some being less than ten seconds long or even just static images. The word "advertisement" can be used interchangeably with "commercial", but UnTrash Wiki defines the two differently to distinguish. Advertisements are possibly the most hated of the three Evil-But-Necessary Unholy Trinity members. They are also the only member that can be blocked or totally ignored.

Mobile ads
Mobile ads are ads that show up on mobile devices like phones and tablets. These ads are much harder to block freely than computer ads as no legitimate ad-blocking software exists for mobile, not even paid. Mobile ads show up as banners, videos, and images. Banners are horizontal ads that may be videos or images. If they're videos, they most likely don't play sound. Video ads are ads that are typically under thirty seconds in duration and can sometimes be skipped by hitting the back button on the device after the ad ran for five seconds. Image ads are ads that take up the entire screen and display an image. This image can be completely ignored by hitting the back button.