# Messages We can honestly say that messaging is the backbone of tekos messenger, we can have plain text, formatted text, we can send emojis, files etc.. We extended the platform by the sidebar and Adaptive Cards. Let's also not forget about the voice calls. But how we can use the Api to send the messages to the platform from outside services like: Tekos Flow or Postman. The whole infrastructure of the tekos messaging platform is built on the Matrix open source project, that's why we suggest to check out their documentation about the chat. In the next documentation we will mention some basic example of the matrix usage. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://tekos.gitbook.io/doc/building-apps-1/chat-surfaces/messages.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.