Happiness may be described as being in accord or synergy with my current condition or situation. Happiness is the state of liking. " Happiness is defined as a state of thought or sensation that is marked by contentment, love, satisfaction, pleasure, or joy. " According to psychologists, happiness is an emotional state that results from the presence of certain physical and mental conditions. The feeling is believed to be universal and exists because we as a species require it for our survival. Psychologists have identified three main factors that contribute to the overall level of happiness in humans: life satisfaction, positive emotions, and negative emotions. Life satisfaction is the degree to which one's life meets one's expectations and standards. Positive emotions include feelings such as joy, excitement, interest, pride, hope, humor, gratitude, relief, and love. Negative emotions include feelings such as anger, fear, guilt, loneliness, disappointment, shame, and boredom. It has been suggested that achieving balance between these two types of emotions is important for happiness. Studies have shown that people tend to be most happy when they are doing what they enjoy and they have what they need. Therefore, having money cannot guarantee you will be happy, but not having enough money can cause severe problems that may lead to depression. Happiness is also affected by your social environment.