http://www.ship.edu/%7Ecgboeree/buddhawise.html

3. Perhaps the most misunderstood term in Buddhism is the one which refers to the overcoming of attachment: nirvana. It literally means "blowing out," but is often thought to refer to either a Buddhist heaven or complete nothingness. Actually, it refers to the letting go of clinging, hatred, and ignorance, and the full acceptance of imperfection, impermanence, and interconnectedness