> For the complete documentation index, see [llms.txt](https://adidas.gitbook.io/api-guidelines/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://adidas.gitbook.io/api-guidelines/asynchronous-api-guidelines/core-asynchronous-principles/messages.md).

# Messages

A message in general is a piece of information that travels from an emitter to a receiver. There are different types of messages:

* Commands
* Queries
* Events