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Nielsen is a global measurement and data analytics company that provides businesses with insights into consumer behavior and trends. Their services are used by companies in various industries, including media, retail, and advertising, to make informed decisions and optimize their strategies. Nielsen's data is collected from a variety of sources, including television viewership, online and mobile usage, and retail sales, and is used to track and analyze consumer habits and preferences. The company also offers consulting and advisory services to help their clients interpret and apply the data to achieve their business goals. With a presence in over 100 countries, Nielsen is a trusted and influential resource for understanding and reaching consumers worldwide.