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HISTORY is the study of human past event and it is left behind by human beings in the form of written documents.its imp for us that we should know our culture,traditional know the history of the common peoples-but legends are traditional stories which may be true or may be may me transformed over tie to make it fresh,vital and realistic.legends are uncertain,never being entirely believed,but also never be resolutely doubted.the brothers Grimm defined legend as folktale historically grounded. professional definition of legend was proposed by timothy r tangerlini in 1990.legend typically is a highly ecotypified historicised narrative performed in conversational mode,reflecting on a psychological level, a symbolic representation of folk belief and collective experiences and serving as a reaffirmation of commonly held values of the groups to whose tradition it belongs.
what do we mean by history?

the definition of history is actually the past events and works which has led to a great change of this world.according to me this should be the perfect definition for the word 'history'.

now the question is :

what do we mean by legend?

legends are also called as  mythologies. i  would  say  that the stories of the past which are very famous are known as legends.they may be true or just false stories.

history and legend:

history and legend are very much related to each other.the historians are just people like us.they  are not god.they an study the things found which belonged to the past.but they cannot very very sure that all the events that they make out are true.the events that they are not sure about that they are true or not , these events are called legends.
so as a fact history and legend are related to each other to a great extent.