Union Flag or Union Jack: Which is correct?

In which situations should the terms 'Union Jack' and 'Union Flag' be used?

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Flag of Hawaii, Meaning, History & Facts

British flag Stock Photos, Royalty Free British flag Images

Forces News - Whether the United Kingdom's national flag

Union Jack: Do you know the correct way up?

The Vexillology of Wales and the Union Flag - Historic UK

Flag of the United Kingdom History, Meaning, Colors & Design

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How can you tell if the union flag (union jack) is upside down?