The main use case is as the branch or SD-WAN, to start with. For example, if you have a branch, for example, for a banking sector, a standalone ADM, for example, and you don't have many options when it comes to connectivity, FortiExtender will help by giving WAN connectivity. 4G, 5G, or 3G, you name it. You just install the SIM card into the device like a hand-sized device. You connect that device, which is the FortiExtender, back to your FortiGate device.
Afterward, you start dealing with the Extender as a virtual interface. So, for example, installing some ADM inside modes where you don't have proper 4G coverage. For example, you can leverage a FortiExtender by installing it over the ceiling. It's like a copper cable back to your communication cabinet. There are a lot of options, a lot of probabilities that widen the possibility when it comes to SD-WAN scenarios.