Few Use cases.

1) If you are writing a program to allow input data for as long as the user wants, it just would not work to have the script loop 30,000 times or even 300,000,000 times. Instead, the code should loop forever, constantly accepting user input until the user ends the program by pressing Ctrl-C.
2) If you have some background process monitoring your servers continuously.
3) Possibly a very good usage is when your server script is listening to a socket for connections.
4) Video Game programming use them heavily.

I differ from some of the above answers posted above which say that "infinite loops are useless".

http://devzone.zend.com/209/writing-socket-servers-in-php/ - An example of infinite loops been put to use.

Creating infinite loops and exiting them with break statements are used in many real life scenarios. Imagine a server accepting connections for example, it is never supposed to stop untill someone tells it to stop.

Someone once said that for(;;) is the best, some swear by while(1) It's purely a stylistic decision. This ain't Python, and all practical compilers trivially transform these to the same thing. (I personally prefer the former.)

Loops have an almost infinite amount of uses. A loop is useful for any sort of task that requires iteration. Is this like when we take code challenges here on Treehouse and we see the "Bummer..." text if we miss a question? No. If there is an actual error with the loop, the code will break and the compiler will let you know, if there is one. But more often than this you'll run into logic errors, where the code runs fine but it isn't exactly doing what you intended for it to do. You can create issues that you don't realize are issues until months down the road. So in real life, there isn't always something to tell you that you're doing something wrong. There are practices and methods to combat this, which you will eventually learn. Do the programmers put every possible correct answer as a 'elseif' statement at the end of the loop and you can only proceed if you input one of those? It sounds like you're referring to a very specific loop / set of conditions. The programmer will make the exact amount of 'elseif' statements the program requires, there really isn't a set standard. For when the possible conditions are too great in number, then there are other ways of going about it without cluttering your code, but any method will essentially do the same thing. I don't think it's terribly common to have that many conditions for one statement, though. Remember that the uses of these tools, such as loops and conditions, are basically infinite. Existing loops and conditions that you'll run across will come in all sorts of different shapes, sizes, and configurations. You're still learning the concepts of how programming works. These sort of concepts will become much clearer to you as you continue learning. Try not to concern yourself with how coding works in "the real" world for now, focus on learning the tools and how you can use these tools to make the program do what you want. That is essentially real programming. Keep learning, and good luck!