Почему мы используем resolve ?

package com.javarush.task.pro.task15.task1520;

import java.io.IOException;
import java.nio.file.DirectoryStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.Scanner;

/*
Перемещение файлов
*/

public class Solution {
    public static void main(String[] args) throws IOException {
        Scanner scanner = new Scanner(System.in);
        Path sourceDirectory = Path.of(scanner.nextLine());
        Path targetDirectory = Path.of(scanner.nextLine());
       try( DirectoryStream<Path> paths = Files.newDirectoryStream(sourceDirectory)){
           for (Path path : paths){
               if (Files.isRegularFile(path)){
                   Path change = targetDirectory.resolve(path.getFileName());
                   Files.move(path,change);
               }
           }
       }

    }
}