Billionaires are individuals whose net worth is at least one billion units of currency, typically measured in dollars. They often accumulate wealth through various means, including successful businesses, investments, and inheritance. The number of billionaires worldwide has increased significantly over the past few decades, with many emerging from industries like technology, finance, and real estate. Billionaires can have a substantial impact on the economy and society. They often invest in philanthropic efforts, supporting causes such as education, health, and environmental sustainability. Notable billionaires include Elon Musk, Jeff Bezos, and Warren Buffett, who are known for their contributions to innovation and charitable initiatives.