What is the difference between detachment and letting go? ?

Detachment is the ability to stay completely disconnected emotionally from a person or situation. Letting go can be viewed in a couple different ways. It can mean that I still have emotions about a person or situation, but I choose to move on with my life and leave that situation behind. It can also mean that I accept that there are things over which I have no control, and I stop trying to change or fix those things. Again I may have strong feelings about those, but I no longer pursue them, because it's a no-win situation.