Assure vs. Ensure vs. Insure

Assure vs. Ensure vs. Insure

Basically, the words assure, ensure and insure all mean the same thing: to guarantee or to promise that something is true or that something will happen. But there are slight differences between them:

Assure means to say or write the guarantee:
He assured me that the product would be delivered tomorrow.

Ensure means to do something to make sure or guarantee that something happens:
A firewall helps to ensure that hackers don't attack your PC.

Insure means to guarantee something with insurance or other financial instruments:
In most countries you need to insure your car against accidents.


Note that we use the infinitive "to" before each of these words.

Source: English in Focus