The Nielsen Corporation is a global marketing research firm that studies consumers in more than 100 countries to determine their habits and identify emerging trends. The company is well-known for developing an audience measurement system, known as Nielsen ratings, that assesses newspaper, radio and television popularity in various media markets.
The Nielsen Corporation promotes itself as an ally of companies that are looking to expand into new markets. Its Nielsen ratings have historically played a large role in helping advertisers decide which media would be the best way to reach target customers. In recent times, the company has increasingly focused on monitoring, analyzing and reporting on what consumers buy and not just what they watch.