What is the different between Set and List

import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
 
public class SetAndListExample 
{
    public static void main( String[] args )
    {
    	System.out.println("List example .....");
    	List<String> list = new ArrayList<String>();
        list.add("1");
        list.add("2");
        list.add("3");
        list.add("4");
        list.add("1");
 
        for (String temp : list){
        	System.out.println(temp);
        }
 
        System.out.println("Set example .....");
        Set<String> set = new HashSet<String>();
        set.add("1");
        set.add("2");
        set.add("3");
        set.add("4");
        set.add("1");
        set.add("2");
        set.add("5");
 
        for (String temp : set){
        	System.out.println(temp);
        }        
    }
}

List example .....
1
2
3
4
1
Set example .....
3
2
10
5
4