If you accidentally delete some text while typing or change your mind about the deletion, you can quickly undo your action without retyping. Or perhaps you want to quickly undo the text you typed without first selecting the unwanted text and then deleting.
Your iPad keyboard has an undo button. Just switch to the numbers keyboard and tap undo. The deleted text will reappear. Or the text you just typed will disappear.
Change your mind again? You can redo your last text action using the redo key. You’ll find it on the math symbols keyboard.