Defining a structure in C involves specifying a blueprint for a composite data type that groups together different variables under a single name. Here's a concise explanation:

Syntax

struct structure_name {
          data_type member1;
          data_type member2;
          // ... more members if needed
      };
      

Explanation:

struct: Keyword indicating the declaration of a structure. structure_name: Identifier for the structure, used to create instances of it. { }: Encloses the list of members within the structure. data_type: Specifies the type of each member variable.

Example:
        struct Point {
            int x;
            int y;
        };

Here, Point is a structure with two members, x and y, both of type int.
1. Keyword and Identifier: • Use the struct keyword to declare a structure. • Provide a unique identifier (e.g., structure_name) for the structure.
2. Member Declaration: • Enclose member variables within curly braces {} after the structure declaration. • Define the data type of each member (e.g., int, float, etc.).