Why does DNA need to be coiled?

If you took DNA and stretched it out, it's actually like thousands of feet long and it has to fit inside your cell on a microscopic level so it's tightly packed and folded back in on itself because it's the only way it would fit. In addition, it contains a lot of letters, 3 billion base pairs.

in cartography, a contour line (often just called a "contour") joins points of equal elevation (height) above a given level, such as mean sea level. a contour map is a map illustrated with contour lines, for example a topographic map, which thus shows valleys and hills, and the steepness or gentleness of slopes.

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