why does it use conio

EXAM_8_8.C

/* Chapter 8 Example 8.8 */
/* //////////////////////////////////////////
    program: EXAM_8_8.C
    This program reads strings from a 2-d array
    and stores them in a data file
    /////////////////////////////////////////  */

#include <stdio.h>
#include <conio.h>

#define ROWS 10
#define CHARS 20

FILE  *fp1;

int main(void)
{
    char names[ROWS][CHARS] = {
                              "Antonius", "Barnabas",
                              "Caesar", "Dorian",
                              "Ethelbreda", "Frankenstein",
                              "Goliath", "Henrietta",
                              "Indiana", "Juno"
                              };

    int thisrow;

    clrscr();
    fp1 = fopen("newnames.dat", "w");

    if  (fp1 == NULL)
        {
        printf("Unable to open file.\n");
        return (1);  /* unsuccessful so quit program */
        }

    for(thisrow = 0; thisrow < ROWS; thisrow++)
        fprintf(fp1, "%s\n", names[thisrow]);

    fclose(fp1);

    return(0);
}