Union can be defined as a user-defined data type which is a collection of different variables of different data types in the same memory location. The union can also be defined as many members, but only one member can contain a value at a particular point in time.
Union is a user-defined data type, but unlike structures, they share the same memory location.
Let's understand this through an example.
struct abc
{
int a;
char b;
}
The above code is the user-defined structure that consists of two members, i.e., 'a' of type int and 'b' of type character. When we check the addresses of 'a' and 'b', we found that their addresses are different. Therefore, we conclude that the members in the structure do not share the same memory location.
