If your Android phone is running out of storage space, many phones will allow you to insert an SD card, which you can set as the phone's primary storage.

I want to put a bunch of ROMs on my SD card for the various emulators on my Android device. I setup the card as "tablet storage" instead of "portable storage". I see a combined 192 GB in the ...

Select the ‘Move apps to SD card’ option. Tap on ‘Move apps’ in the pop-up message that comes up. The process usually takes some time so wait for the process to come to an end.