A structure is a composite data type declaration that defines a physically grouped list of variables to be placed under one name in a block of memory, allowing the different variables to be accessed via a single pointer.

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Defining a structure in C: In C language a structure is defined using struct keyword followed by variable or pointer name below is the basic syntax for declaring a structure in C language.

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struct tag_name

{

type member1;

type member2;

/* declare as many members as desired, but the entire structure size must be known to the compiler. */

};