Could you give us the context of this question? I assume you are asking about Lab 1 Project 3, but I don't know for sure.
System.out.println() will print a blank line into the console and move the cursor to the next line. The purpose of printing a blank line in this context is to create spacing between your letters, making them easier to read (and look a lot nicer). Sure, your code will still work without printing blank lines, but the overall goal is to create a readable output, which is why they are encouraged.