> For the complete documentation index, see [llms.txt](https://bus.node-ts.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://bus.node-ts.com/guide/messages.md).

# Messages

Messages are small pieces of data that get passed around between services. They can define an instruction to perform an action, or report that something has just occurred.

Messages are sent by a publisher and received by 0 to many subscribers depending on the type of message and if your system requires it to be handled.