I am confused about these two words how they differ in usage. Would be easy if explained with example.

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    – Em1
    Sep 2 '13 at 10:10
  • Apart from their having similar pronunciation, what leads you to confuse them? Sep 2 '13 at 12:47
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    I've voted to close this question for the time-being because it appears that this question can be answered by looking up both "effect" and "affect" in a dictionary, and such questions are off-topic for ELL. If you rephrase the question to include the definitions of both and you still have problems, the question will be reopened.
    – Matt
    Sep 2 '13 at 20:44

There are lots of examples of usage for each sense of affect (OALD definition) and effect (OALD definition) at their dictionary definitions.

However, an interesting case appears with the following sentences.

The UN affects changes in our foreign policy.

The UN effects changes in our foreign policy.

Both sentences are valid, but have a different meaning. In the first, the meaning is that the UN influences planned changes in our foreign policy. In the second, the UN initiates changes in our foreign policy.

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