The page has categorise and organize collection/list of various GIS data and Remote Sensing data sources. These datasets are collected from various sources around the globe. You can enjoy the data in vector file formats (.shp, .dgn. etc.) and raster file (DEM, DTM, satellite imageries in .tif or .img formats). These data GIS data and remote sensing data sources covers almost all possible domain of GIS and remote sensing applications. They are compressively collected and organized for very country (best possible). 

Now the power to  visualize, question, analyze, and interpret data to understand relationships, patterns, and trends is now in your hands. 

Note: Did not suggest data accuracy or correctness. Data may be inaccurate or wrong.