The UN Statistics Division of its Department of Economic and Social Affairs created this portal to bring together information from statistical databases throughout the UN in order to streamline research. It currently contains 33 databases and approximately 60 million records. The Update Calendar on the main page explains which UN group provides the statistics, indicates when the data was last updated, and also when the next update is scheduled to take place.
Available topics range from energy statistics to marriage data, each with a large amount of sub-areas. The data can be accessed by conducting a keyword search, a more detailed advanced search, database explorer mode (an expandable listing of all datasets, sources of data, and topics included within UNData), or by country/area.
Once you find the data you need, you can customize your results (by country, year, etc. depending on the information searched) and download them (up to 50,000 records at a time).