Wikipedia describes it as this:
Fartlek, which means "speed play" in Swedish, is a training method that blends continuous training with interval training.[1] The variable intensity and continuous nature of the exercise places stress on both the aerobic and anaerobic systems. It differs from traditional interval training in that it is unstructured; intensity and/or speed varies, as the athlete wishes.[2][3] Most fartlek sessions last a minimum of 45 minutes and can vary from aerobic walking to anaerobic sprinting. Fartlek training is generally associated with running, but can include almost any kind of exercise.
It is supposed to help you increase speed and endurance. I think I may need to incorporate this into my runs.
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