Strictly speaking, it is incorrect to use insure and ensure interchangeably. Ensure means to make sure or to guarantee and insure refers to the financial service of insurance.

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Ensure

Insure

Meaning to make sure, to guarantee to safeguard against loss or damage (by buying insurance).

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The word insure is used mostly in a financial context as it relates to insurance. For example,

The word ensure usually means "to make sure" or "to guarantee". For example,

edit Video explaining the ensure - insure difference

edit Usage in the U.S.

In colloquial usage — especially in the United States — the words insure and ensure are indeed used interchangeably. So some dictionaries list a secondary meaning of the word insure as a synonym for ensure.

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"Ensure vs Insure." Diffen.com. Diffen LLC, n.d. Web. 28 Jul 2015. < >