What is Index or key on a map? Why is Index an important component of a map. -Geography

What is Index or key on a map? Why is Index an important component of a map. -Geography
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Index or key symbol used to represent any feature is called index. The index is an important component and represents all the features shown on a map. Various colours and symbols are used in the index, e.g. blue colour for water bodies, green for lowlands, etc.
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