Answer:
On maps, we use different types of symbols, numbers, signs, interpretations, descriptions to represent different places like cities, commercial centers within cities, parks, mountains, bus stands, airports, museums, playgrounds etc. The map legend is the place on the map, in the form of small box which helps us in understanding all of the used illustrations of the map. For example, if there is a sign of small square red colored sign placed on the map, which has been used to represent airport, then in order to understand what this sign actually represents there, we need to go the map legend, where you can find that small square red colored sign with the label of airport, so you can easily understand its the airport on that place on the map.
