> ## Knowledge Base Index
> Fetch the complete knowledge base index at: https://biasinvestors.crisp.help/sitemap.xml
> Use this file to discover available pages before exploring further.
> Pure-Markdown content can be obtained by appending a '.md' suffix to the content URLs listed in the sitemap (without the trailing slash).

# Advertisement

A written or electronic communication in the public media such as newspapers, magazines, radio, and television addressed to an unknown audience. Contrast with: [Sales Literature](/en/article/sales-literature-zgc3on/).