tonal distribution of an image in a graph based form - What is a tonal distribution ? The amount of different levels of light/dark areas present in an image - Why is a histogram important in Photography ? The true output of an image is not easily visible in the conditions a photographer may be clicking as the camera LCD itself is susceptible to changes in the light around it. A histogram lets you know the exact tonal distribution in form of a graph so that the photographer can understand the type of output he will get, and also warns you about over and underexposures
in doubt 2. Have a minimum exposure speed of 1/8 if not using tripod 3. Try to avoid flash as much as possible 4. Makeshift Tripods ! 5. Try to reduce the clutter by moving closer to the desired object and/or waiting for a better moment 6. Pattern Breakers 7. Try over/under exposing to get details