iOS apps create temporary files during their operation. These files are rarely used afterwards and some of them linger on your iPhone, iPad, or iPod Touch for longer than you may think. Over time, temporary files accumulate which takes up space and can even slow down the device.
What happens when I delete temporary app files?
Temporary app files are not essential for the operation of iPhone apps and are often left unused once saved in the temporary folder. Therefore, deleting temporary files from your iPhone, iPad or iPod Touch does not have a detrimental effect on iOS apps and will only free up space on the device.