High Dynamic Range or HDR Photography

HDR is a set of techniques that allow a greater dynamic range of luminance between the lightest and darkest areas of an image than current standard digital imaging techniques or photographic methods. This wide dynamic range allows HDR images to more accurately represent the range of intensity levels found in real scenes, ranging from direct sunlight to faint starlight. When the lighting conditions fail a photographer HDR is the only chance to capture the views.

Here is a sample of how an HDR image is taken: