What does HDR mean?

HDR is an abbreviation that comes from high dynamic range. HDR is a technique that allows a greater dynamic range between the lightest and the darkest areas of an image. HDR photos are actually several shots combined together. Pictures are taken from the same subject matter by using exposure bracketing. For example, if the HDR photo is made by using three images, one of them is taken with normal exposure, one underexposed and one overexposed. Stop difference and amount of the images can change. Normally the amount of images are either three, five or seven. Afterwards all the shots are put together in a software, like Photoshop. Some newer cameras can also create HDR files. In that case, you don't need a separate software for that. Remember that HDR doesn't always make the image look better! It works best with scenes that have a lot of contrast.