```
String color1 = moreColors.get(0);
String color2 = moreColors[0];
System.assertEquals(color1, color2);

// Iterate over a list to read elements
for(Integer i=0;i<colors.size();i++) {
    // Write value to the debug log
    System.debug(colors[i]);
}

```

I am learning Apex and just started what is meaning of line `System.assertEquals(color1, color2);` and what is mean by debug log here?