The histogram is a tool that is useful to the photographer that shows a graph that represents how much color or bright and dark areas are in a photo. If you're looking at a photo that has a larger portion of the histogram graph on the left, it means there's a lot of dark / black tones - and that details in those areas are likely lost. The same holds true if the graph was heavy to the right edge - but it would mean there is a lot of bright or whites. Subtle details in these areas would also be lost. You can use the graph to adjust your exposure so that these details are visible. A wedding dress that lacks the fine lace details because the whites were "blown" (over-exposed) lacks interest when compared to a photo that preserves the details. Here's a link to a site with some great info in general - and about histograms specifically. Check it out.
Tinker with exposure settings to move the large areas of the graph away from the edges - this will show the details. You can switch the histogram off and on as you see fit.
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