Generally, this would refer to the window that shows up when executing the command to launch Matlab. The IDE provides a workspace for executing commands and storing of data sets. The various buttons with associated commands make up the interface that allows you to manipulate your data and with the available functions.
The window that shows up is the IDE, providing the workspace for executing commands and storing of data sets. The various buttons with associated commands make up the interfaces that allow you to manipulate your data with the available functions or your own functions.
MATLAB is a high end technical computing tool. The interfaces like Simulink would be an arena where people can design their block diagrams with data and analyze it for various standard test signals. In the below link, you can find many sample files to undestand the MATLAB environment better.