noun
Refers to using something for one's own private purposes, not for business or public use.
このソフトウェアは個人使用に限ります。
This software is for personal use only.
会社の備品を個人使用してはいけません。
You must not use company equipment for personal purposes.
私用 also means 'private use' but often implies using something for personal errands or private matters, sometimes with a nuance of misusing company time or resources. 個人使用 is more neutral and simply states the purpose is personal, not commercial or official.
Compound of 個人 (individual, personal) and 使用 (use, usage).