What is iTunes used for exactly?

Because I'm wondering whether I should delete it from my PC. I have iPhone but I don't have any music on it, and don't plan to. Is this all iTunes is used for? If so, then I will uninstall it.

ITunes is a media management software. You can use it to manage and play both audio and video files on your computer.

You use it to backup and restore your phone, move files, download music and apps, play music, change passwords and other settings, rearrange the icons on your phone's screen, and about a dozen other things. You seem to think it only has one purpose.