Difference between Union & Structure

SN.	Structure	Union
1	Struct keyword is used to make structure variable	Union  keyword is used to make structure variable
2	Structure is user defined data type which is used frequently to represent real word data type presentation.	Union is also a user defined data type which is used to achieve specific need.
3	Structure allocates memory for its all member.	Union allocates memory only for the biggest data member.
4	All member data can be hold at same time in a structure variable.	Only one data from member can be hold at a time.
5	Several members can be initialized at ones.	Only first member can be initialized.

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