Public data is two things. First, it is all YouGov data not primarily created for commercial use. It is generated for society at large. Public data informs, educates, and advances our understanding of society, culture, economics, politics and policy. Second, YouGov offers free commercial proprietary data that is illuminating, but doesn’t have all the detail that market researchers need. For example, we publish regular brand rankings from YouGov BrandIndex. But not the daily movements and all the demographic detail. With Ratings, it is similar. We show the profile of audiences for thousands of people, products, brands, and media entities, but not with the all the depth of data available in YouGov Profiles. At its best, YouGov's public data can help make a world a better place. It empowers citizens, institutions, and countries to make better choices. We help them understand how the world is, and how it is changing. We provide opinion tracking, regular surveys, accessible visualisation, and in-depth analysis - all for free. YouGov's public data automated trackers run 52 surveys in key markets. Data points are updated from weekly to annual cadences. They cover everything from COVID-19 to political divisions, and from the national mood to favourite fast foods. Public data is crucial part of YouGov's own connected data archive. It contains our members’ changing thoughts, opinions, and feelings; millions of respondents in 38 countries, collected over two decades. This data, alongside other ad-hoc surveys, form our key media partnerships. We are a trusted partner of organisations ranging from Yahoo News to CBS to Reuters. Taken together, we share a powerful and unique encyclopaedia of public opinion. It represents one of the greatest and free resources for consumers, businesses, and voters. It helps everyone all over the world to understand the world in which we live.