> ## Knowledge Base Index
> Fetch the complete knowledge base index at: https://cheddarflow.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).

# What is a block?

Option block orders usually signal massive size purchases used by institutional investors and traders with very deep pockets. These are negotiated privately from the public market, meaning you won’t be seeing individual retail investors buying these up.