Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A millionaire (originally and sometimes still millionnaire) is an individual whose net worth or wealth exceeds one million units of currency. It can also be a person who owns one million units of currency in a bank account or savings account. Depending on the currency, a certain level of prestige is associated with being a millionaire, which makes that amount of wealth a goal for some, and almost unattainable for others. In countries that use the short scale number naming system, a billionaire is someone who has at least a thousand times a million dollars or euros or whatever the currency of the country is. In countries that use the long scale number naming system, a billionaire is someone who has at least a million times a million units of currency.