A subliminal will change the beliefs that are locked away in your subconscious mind. By consistently listening to a subliminal the positive affirmations recorded on the subliminal will bypass your conscious mind and place new beliefs in your subconscious.
Any self-defeating program that you have been carrying around, probably most of your life, will be replaced with new programming. This will allow you to achieve new desires and meet your goals.
False beliefs locked in your subconscious mind can sabotage your efforts. For example, if you believe you are poor and deserve to be poor, you are going to stay poor no matter what. Even if you make a lot of money you will eventually lose it in some way or another.
The good news is that a subliminal can completely reprogram your subconscious mind to automatically lead you and help you achieve your desires and goals.