What is system data on my iPhone?
I have lots of system data- what is it. How I delete it. It’s about 175 GB and taking too much of space
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iPhone 12 mini
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System Data (formerly called "Other"), basically contains unnecessary files such as caches that are used for system ease of use - all of which gather over time. Caches would be being used for remembrance of application use. This could also include iOS Updates that have downloaded, but not yet installed -- possibly due to low battery or available space.
You may wish to BackUp and Restore your device to reclaim that space.
-> How to back up your iPhone, iPad, and iPod touch - Apple Support
-> Restore your iPhone, iPad, or iPod touch from a backup - Apple Support