MyLeoNes™

Undo — Computing, 4–6

You can take back a recent change instead of starting again. Computing, 4–6 years.

Undo means take that back

When you change something on a computer, you can often ask it to put things back as they were. That action is called undo. It is like rubbing out one fresh crayon mark without throwing away the whole picture.

Why undo was needed

People make small slips: they delete a word, colour the wrong place, or move a sticker by accident. Before undo, fixing one slip could mean doing lots of work again. Undo was made so you could try things boldly and recover from a recent mistake.

Undo one drawing change

You draw a yellow sun. Then you tap the blue colour and make the sun blue by mistake. First, stop drawing; next, choose Undo; finally, look at the picture. The blue mark disappears and the yellow sun comes back, while the earlier parts stay there.

Undo is not a magic eraser

A common mistake is pressing undo many times, hoping it will remove only the one thing you dislike. That is understandable because each press changes the picture. But each press usually goes back one step, so too many presses can remove changes you wanted to keep.

Undo outside school

You may use undo while drawing, writing a message, arranging photos, or building a game. A music app can undo a sound cut, and a map app can undo a route change. It helps whenever a recent digital action needs taking back, but it cannot repair a broken real object.

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