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Grids are formed when parallels of latitudes & meridians of longitudes intersect each other thus giving us a specific location of the place.
Like suppose India extends from 8°4' N to 37°6' N latitude & 68°7' E to 97°25' E longitude.
This is how with the help of grids we can locate the places easily.

grids give us the correct idea about locating a place.... it makes our work easier & faster