Well, most simply, it is a plan that modifies your diet (eating) to affect fat loss. There are numerous examples all over the web. Things ranging from complete crack-pot hoaxes, to legitimate plans.
They include things like fasting (bad) to things like eating only protien (atkins) also bad for long term satisfaction.
However, If you're really interested in losing fat as fast as possible while keeping it off, I explain why and how my fat reduction plan works in my new weight loss and diet program.