Difference between Structure and Union

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Structure	Union
A structure can store multiple values of the different members.	A union stores one value at a time for all of its members.
A structure's total size is the sum of the size of every data member.	A union's total size is the size of the largest data member.
User can access or retrieve any member at a time.	User can access or retrieve only one member at a time.
You can use a struct keyword to define a structure.	You can use a union keyword to define a union.
It occupies space for each and every member written in inner parameters.	It occupies space for a member having the highest size written in inner parameters.
It supports flexible array.	It does not support a flexible array.