What is the difference between efficient and effective?

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Q: What is the difference between efficient and effective?

A: "Efficient" means having a high ratio of output to input. Efficient also means means working or producing with a minimum of waste. Example 1: "An efficient test engineer wastes no time". Example 2: "An efficient engine saves gas".

"Effective" means producing, or capable of producing, an intended result; or having a striking effect. Example 1: "For automated testing, WinRunner is far more effective than an ordinary oscilloscope". Example 2: "For rapid long-distance transportation, the jet engine is more effective than a witch's broomstick".