# Visual Structure

This section defines terms and concepts used in the scope of the `RadChat` control with which you have to get familiar before you continue to read its documentation. They can also be helpful when contacting our support service in order to describe your issue better.

![RadChat Visual Structure](https://www.telerik.com/winui/documentation/assets/b9586b1c1ec92529bccd1dfb883cfdbc/radchat-visual-structure-0.png)

* **Current author**—An instance of the `Author` class that is set to the `CurrentAuthor` property of RadChat.
* **Non-current author**—An instance of the `Author` class that is not the one set to the `CurrentAuthor` property.
* **Message input box**—The input box for inputting a message.
* **Send button**—Button to send the input message.

## See Also

* [Getting Started](https://www.telerik.com/winui/documentation/controls/radchat/getting-started)