An issue with all projections is that they have to distort or change in some way the representation of shape, area, direction, or distance of land features or graticule in one way or another in order to "flatten" the globe to a piece of paper.
Some projections are good at keeping the true shape of land features on a flat map, but they make the representation of distance on a map longer or shorter than it is in real life, or the direction of features is not correct, or maybe the representation of the area of a country, or ocean is not representative of the actual area of that feature in real life.
Click on the characteristics of map projection below to find out more:
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