In every society, people are categorized in different groups. One of these categorizations is the category of Pessimists and Optimists. Every day we meet many types of people, the persons who are always happy, full of energy and give others positive sense. These people work actively and they always have solutions for every problem. We also, encounter with the people who look unhappy in every situation, they are always complaining and think everything is against them. Although these two kinds of persons are in the same society and have the same situations but the differences between them are enormous. I believe by being around optimists we can learn to see and make the world as a better place than being around pessimists. The first type is called pessimists. They are individuals who always see the empty side of the glass. For example when a problem occurs, they think that they are the cause of the problem; it is a permanent situation and they have no way unless suffering. They look for the negative point of what happened instead of changing the circumstances. These people are always complaining about life. Moreover pessimists always have a sad face and believe which getting happiness is hard because man is created helpless. Suppose a pessimist which you give him/her expensive and beautiful gift, he/she would never surprise about that and never enjoy it. It is clear that such a person would not be pleasure for you and it is hard to be around them and make or create relations and communications with them, because they cannot help themselves as well as others. In contrast with pessimists who are very negative, there is another type of persons who are positive people called optimists. An optimist is someone who is always sees the full half of the glass. They are active and full of energy. Such people never accept inevitable and attempt to solve it in some way. For instance, when they face difficulties they try to find solutions instead of being helpless. They spot every problem or difficulty as a temporary condition. They have a positive perspective to everything happened and also have a good view of themselves. Being around these individuals give others happiness and good sense. They are always energetic and can make every situation comfortable and gracious. So, they can be good advisers and supporters. In conclusion, I can say despite their same conditions, optimists are more successful and useful in the society. I believe they are able to be good teachers and advisers and we can learn them many things. They are the people that make the world brighter.