We often hear the words, "let go" what do these words mean, and is it easy and simple to let go?

Psychology, self-improvement and spiritual traditions speak about letting go and the benefits of embracing it, but what is it?

Letting go means detachment, the removing of attachments to anything that makes you unhappy or suffer, 

Here is another meaning of let go: its the act of detaching yourself from unpleasant, meaningless or harmful thoughts and feelings.