Final answer:
A MessageBox is a type of dialog box used in computer programming to convey messages to the user and often requires interaction to proceed.
Step-by-step explanation:
A MessageBox is indeed a type of dialog box. In the context of computer programming and graphical user interfaces, a MessageBox is a pre-defined dialog box that displays a message to the user and often requires user interaction before continuing. It is used to inform the user about a particular operation, error, or to prompt for a response. The content of a MessageBox can include text, symbols, and buttons such as 'OK', 'Cancel', 'Yes', and 'No'. As such, it functions as a simple form of dialog box designed to display messages.