Efficient or effective?

Efficient and effective are adjectives.

We use efficient to describe something or someone that works in a quick and organised way:

The new online banking system offers a convenient and efficient way to check your account.

[extract from a reference for someone applying for a job]

I have always known James to be highly competent and efficient in all aspects of his job.

We use effective to describe something that gives you the results you want:

Taking this tablet is a very effective cure for travel sickness.

In this light, the camera is more effective if you use the flash.

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