The Mainstream category is those that cater to a broad audience and typically include content that is considered safe, non-controversial, and suitable for a wide range of users. Publishers operating in a mainstream category often deal with content that is mainstream in its appeal, such as news, entertainment, lifestyle, and popular culture.

In a simple word, the mainstream category is for those who do not work with 18+ content and do not want advertisements is shown on their website.

Please be informed, the mainstream category contains advertisements without 18+ content, but including mainstream dating, betting, gambling, games content.

The Non-mainstream category is suitable for some publishers who want to monetize traffic with 18+ advertisements. Usually, the non-mainstream category is chosen by publishers who have websites for adult people.

You can select the category for both websites and DirectLink. To select the category, go to the HilltopAds account for publishers and navigate to the Manage Site & Zones section. Click on the Add Site or Add Direct Link buttons and select the preferred category.

If you choose the wrong category, only a personal manager can change it. So, you need to contact them via telegram, skype, email or online chat.