Maps are basically used to find places, but since there many types of maps , their uses vary according to, topography maps are used to grid references of a given place..
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Maps are graphical representation of physical & political features of a country, state or of the world.
They are mainly used to know the exact location of a place. 
Place like Kolkata, Europe, Africa, India etc even seas, oceans, gulfs, can be located & their exact position can be known with the help of the maps.
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