The Copernicus DEM is offered in three main resolutions to suit different project needs:
The Copernicus DEM is a that includes all natural and man-made features like buildings and vegetation. While it is not a "pure" DTM (which removes these features), it is one of the highest-quality global elevation products available, derived from the TanDEM-X mission . Available Data Instances
A near-global dataset available to the general public under a free license.