我无法理解如何使用malloc创建2D数组

#include <stdio.h>
#include <stdlib.h>

int main() {
    int rows, cols;
    int** array;

    printf("Enter the number of rows: ");
    scanf("%d", &rows);

    printf("Enter the number of columns: ");
    scanf("%d", &cols);

    // 分配指针数组的内存
    array = (int**)malloc(rows * sizeof(int*));
    if (array == NULL) {
        printf("Memory allocation failed.\n");
        return 1;
    }

    // 分配每个指针指向的内存
    for (int i = 0; i < rows; i++) {
        array[i] = (int*)malloc(cols * sizeof(int));
        if (array[i] == NULL) {
            printf("Memory allocation failed.\n");
            return 1;
        }
    }

    // 初始化和访问数组元素
    for (int i = 0; i < rows; i++) {
        for (int j = 0; j < cols; j++) {
            array[i][j] = i + j;
            printf("%d ", array[i][j]);
        }
        printf("\n");
    }

    // 释放内存
    for (int i = 0; i < rows; i++) {
        free(array[i]);
    }
    free(array);

    return 0;
}