Billionaires are individuals whose net worth is at least one billion units of currency, typically measured in dollars. They often accumulate wealth through successful businesses, investments, or inheritance. The number of billionaires has increased significantly in recent years, 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 various sectors, create jobs, and contribute to philanthropic efforts. Notable billionaires include Elon Musk, Jeff Bezos, and Warren Buffett, who are known for their influence in technology and finance.