How to remove other data on iPad

What is "Other"

It’s generally a combination of local caches from apps, browsers, mail, Messages, Reading List, saved games, app-specific documents and data, notes, and voice memos.

You can backup and restore to reduce "other" but they will start building up over time.

What is the Other on my iPhone and How to Remove It

Less than abount 1 1/2 GB is normal. If greater that tends to indicate corrupted files