Safari app

That is cached data by Safari app. There is no need for you to do anything as iOS purges cached data automatically when disk space used by it is needed by system or other app.

Is your iPhone low on disk space? If you don’t get prompts that your device is low on free space then you are all good.

You can’t remove the Safari app.

What problems are you having?

You cannot. One of only few apps that cannot be simply deleted.

Why do you want to do this? What’s the issue with Safari that you would like to do this.