The typedef is a keyword used in C programming to provide some meaningful names to the already existing variable in the c program. It behaves similarly as we define the alias for the commands. In short, we can say that this keyword is used to redefine the name of an already existing variable.

Syntax : 

typedef <existing_name> <alias_name>  

Example : 

#include<stdio.h>  
#include<conio.h>
int main()  
{  
typedef  int unit;  
unit i,j;  
i=10;  
j=20;  
printf("Value of i is :%d",i);  
printf("\nValue of j is :%d",j);  
return 0;  
} 

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