Ensure: to make certain.
Insure: to protect against loss.
Assure: to give someone confidence. (The object of this verb should always refer to a person.)

Examples:
I want to ensure (make certain) that nothing can go wrong.
I want to assure you (give you confidence) that nothing will go wrong.
I want to insure this necklace (protect it against loss) for $5,000.

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